Such an Antelope, however, as the Eland (Orias) is very Ox-like in habit.
The only two points which distinguish all Bovidae from all Cervidae[210] are the nature of the horns already described, and the polycotyledonary condition of the placenta.
The Pronghorn is a gregarious creature running in bands of six up to hundreds.
In other Arthropods the cerebral ganglia arise in a similar way, but the invaginations disappear in the adult.
According to Fol these organs originate in aquatic Pulmonata as a pair of invaginations of the epiblast, slightly behind the mouth.
In the region of the hind-brain two shallow epiblastic invaginationsform the rudiments of the auditory pits (au.
B, Olp) as invaginations of both layers of the epiblast.
In my original account of the development I held these tubes to be invaginations of the peritoneal epithelium.
Like the lens and the labyrinth of the ear, they are formed as invaginations of the external epiblast; unlike them they are never closed up.
May not these invaginations be really rudiments of the eyes as well as of the ganglia?
That the greater part of the flat cells which line the passages of most Sponges are really derived from epiblastic invaginations appears to me to be proved by Schulze's and Barrois' observations on the young fixed stages of Halisarca.
The epiblastic invaginations are represented in it very accurately, and though not mentioned in the text of the paper, Moseley informs me that he has long been aware of the homology of these folds with those in various other Tracheata.
In Apis there are eleven pairs of tracheal invaginations according to Kowalevsky (No.
The openings of these invaginations extend from the oral cavity forwards; and they are shewn in fig.
In a very considerable number of cases amongst Gasteropods and Pteropods the auditory organs have been observed to develop as invaginations of the epiblast, which give rise to closed vesicles lying in the foot, e.
Buetschli for Pilidium regards these pits as formed by invaginations of the epiblast, but Metschnikoff's statements are in accordance with those in the text.
These invaginations appear at the two opposite poles (anterior and posterior) of the blastoderm.
Two pairs of invaginations of the skin, just as in the type of Desor, now make their appearance, one pair in front of and the other behind the mouth (fig.
B), and four invaginations of the epiblast make their appearance on the ventral surface (fig.
Shortly after the appearance of the three pairs of appendages behind the antennae two further pairs become added, and at the same time oral and anal invaginations become formed (fig.
Irregular invaginations of the epiblast give to the young sponge a honeycombed structure.
Their openings become closed, and the walls of the invaginations constitute a large part of the embryonic supra-oesophageal ganglia.
The stomodaeum and proctodaeum are invaginations of the epiblast, while the mesenteron is lined by the hypoblast.
The epiblastic invaginations may be recognised in all stages of growth by their chitinous lining and layer of chitinogenous cells, continuous with the similar layers in the external integument.
Not unfrequently two or more invaginations are seen in the same subject.
According to the same author, the average age of ileo-caecal invaginations is 18.
In Endopterygota the wings commence their development as invaginations of the hypodermis, while in Exopterygota the wings begin--and always remain--as external folds or evaginations.
In some embryos there is but a single pair of these rudiments (or vestiges) situate on the first abdominal segment, and in some cases they become invaginations of a glandular nature.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "invaginations" in a variety of sentences. We hope that you will now be able to make sentences using this word.
