He also forgot to say that it was a secret, and so they spoke freely of it to the Crayfishes and the Caddis Worms.
She was thinking how quickly she would shake off the little Crayfishes if they were her children.
Her legs were almost useless, there were so many little Crayfishes clinging to them.
Each one had so many eyes that he could look at the teacher with a few, and at the other little Crayfishes with a few more, and still have a good many eyes left with which to watch the Tadpoles.
The little Crayfishes soon got together again, and while they were talking, one of their many aunts came along with all her children hanging to her legs.
While their mother was so weak, the Wise Old Crayfish amused the children, and taught them things which allCrayfishes should know.
The crayfishes of England and Ireland (Astacus, or Potamobius, pallipes) are generally about 3 or 4 in.
Farther east a gap occurs in the distribution and no crayfishes are met with till the basin of the Amur is reached, where a group of species occurs, extending into northern Japan.
The area of distribution occupied by the southern crayfishes or Parastacidae is separated by a broad equatorial zone from that of the northern group, unless, as has been asserted, the two come into contact or overlap in Central America.
In South America crayfishes are found in southern Brazil, Argentina and Chile.
At present, I am very busy about Crayfishes (Flusskrebse), working out the relations between their structure and their Geographical Distribution, which are very curious and interesting.
The crayfishes would leave these little retreats whenever disturbed, and swim away down stream out of sight.
Crayfishes may be taken by a net baited with dead fish, or they may be caught in a trap made from a box with ends which open in, and baited with dead fish or animal refuse of any sort.
After some weeks the young crayfishes issue from the eggs.
On the Pacific coast the crayfishes belong to the genus Astacus.
The hermit crabs are not true crabs, but are more nearly related to the crayfishes and shrimps than to the true broad-bodied, short-tailed crabs.
Throughout the greater part of Asia no Crayfishes are found until we come to the Far East, where we find an isolated colony in the river-system of the Amur, in Korea, and in the north of Japan.
The black patches mark the areas inhabited by the Southern Crayfishes (family Parastacidae)] Crayfishes are found in the fresh waters of the Northern and Southern Hemispheres (Fig.
A similar case to that of the Crayfishes is found in the River Crabs of tropical countries, belonging to the family Potamonidae.
The dotted areas are those occupied by the Northern Crayfishes (family Astacidae).
In other parts of the world it does not seem that the fresh-water Crayfishes are of much importance as an article of food.
On the other hand, the larger Crustacea, like the Crayfishes and River Crabs, which cannot so easily be transported from one locality to another, have as a rule a more restricted range.
Several species of blind Crayfishes have been found in caves in North America, the best known being one (Cambarus pellucidus--Plate XXV.
This applies, for instance, to the case of the Crayfishes and the marine Lobsters, and to that of the River Crabs, as compared with those which live in the sea.
There is thus a general correspondence between the geographical distribution of the Crayfishes and the more important structural differences expressed in their classification.
It is clear, however, that the means of dispersal of the Crayfishes are very limited, and on this account the problems connected with their geographical distribution are of great interest.
Cranes in Alberta Crane, Whooping Crater Lake National Park Crayfishes eaten by shore-birds Credit for work done Cree Indians Crow, ducklings destroyed by Crow, F.
Their warfare on crayfishes must not be overlooked, nor must we forget the more personal debt of gratitude we owe them for preying upon mosquitoes.
Observe living crayfishes in their usual habitat or in a large aquarium, without disturbing them, and see where they stay when they are free to choose.
How does it compare in size with other crayfishes in the laboratory?
What conditions must be maintained in order that crayfishesmay succeed, i.
Name two points in which earthworms and crayfishes are alike.
For what different purposes have you seen thecrayfishes use their large claws?
Consider also the habitual motions of mouth parts and swimmerets, the bubbles sometimes seen when a crayfish is dropped into water and the habit crayfishes have of lying on one side, close to the surface of the water.
Early in the spring crayfishes may be found carrying eggs or young.
If the crayfishesare in plenty of water and you startle them in any way, some of them may swim.
What are the varying conditions in their surroundings which crayfishes must meet?
Explain the fact that crayfishes are often found alive and well with a soft shell?
Small crayfishesare desirable to show locomotion in water.
Summary of the Study of Crayfishes To summarize your study, write a connected account of the relations of crayfishes to their environments, under the following topics:-- 1.
Do the crayfishes of a region vary noticeably in numbers from year to year?
When the crayfishes of a given locality are not well adapted to it, what can they do?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "crayfishes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
