Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 G ^ Fig 22 —a, C iticle aud lij pjdtnnis ot the lar\a of Corethra b, cuticle and hypodermis of a Gastro pacha caterpillar, with two poison glands beneath corresponding bristles. may exhibit various patterns of difl:erent kinds. Very frequently the surfaces of the individual cells are indicated on tlie cuticle as polygonal figures; and, in addition to the very fine pores, there are also found larger passages pro- duced by out-growth from
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 G ^ Fig 22 —a, C iticle aud lij pjdtnnis ot the lar\a of Corethra b, cuticle and hypodermis of a Gastro pacha caterpillar, with two poison glands beneath corresponding bristles. may exhibit various patterns of difl:erent kinds. Very frequently the surfaces of the individual cells are indicated on tlie cuticle as polygonal figures; and, in addition to the very fine pores, there are also found larger passages pro- duced by out-growth from the cells. These latter lead to the appearance ©f various cuticular appendages, such as hairs, bristles, scales, etc., which are placed on the cuticular pores, aud con- tain as a matrix their special cell or a process of it. Cuticular membranes may obtain a very considerable thickness, and, by the deposit.'on of calcareous salts, a high degree of firmness (carapace of Crustacea) so that they acquire the value of skeletal tissue.^, which, Fig. 22e.—Cu, cuticle with bristles in the condition of ecdysis. Cu', newly-formed cuticle (Brajichipus).
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