We need not feel much surprise at points of chitine being hard enough to wear away shell, when we consider what work the jaws of insects, likewise formed of chitine, will effect.
Inasmuch as the successive layers of shell, during each period of growth, go on encroaching on those of the membrane, the line of junction between the shell and chitine becomes oblique or bevelled.
The orifice is formed on each side by a toothed rim of hard chitine (fig.
In some other specimens, badly preserved, the chitine membrane was quite colourless, and sack and cirri dirty lead-colour.
The membrane of the ball falls to pieces in caustic potash, differently from the chitine membrane of the enclosed peduncle, and this shows that there is some difference in composition from ordinary cement.
The males are imbedded in the spinose chitine border of the occludent margin of the scuta, exactly over an oblique fold or notch (fig.
The male must live on the nourishment acquired during its locomotive larval condition; and its life no doubt is short, but yet not very short, as I infer from the depth to which mature specimens are buried in the chitine border.
Valves minute, thin, generally more or less linear, placed far distant from each other; sometimes imperfectly calcified and covered by chitine membrane, or imbedded in it.
During continued growth, the valve is added to in thickness, and so is the chitine border, and likewise in breadth.
Hence the typical character of the motor organs of the crustacea lies in the circumstance that both in the body and the limbs the muscles are attached to the interior of hollowchitine tubes, and go in these from member to member.
In the echinoderms the calcareous skeleton is formed from chalky deposits in the corium, in the articulates from chitine secretions of the epidermis, and in the vertebrates from cartilage of an internal chord-sheath (cf.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "chitine" in a variety of sentences. We hope that you will now be able to make sentences using this word.
