Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 a FIG. 22.—a, Cuticle and hypodermis of the larva of Corethra. b, cuticle and hypodermis of a Gastro- pacha caterpillar, with two poison glands beneath corresponding bristles. may exhibit various patterns of different kinds. Very frequently the surfaces of the individual cells are indicated on the cuticle as polygonal figures; and, in addition to the very fine pores, there are also found larger passages pro- duced by o
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 a FIG. 22.—a, Cuticle and hypodermis of the larva of Corethra. b, cuticle and hypodermis of a Gastro- pacha caterpillar, with two poison glands beneath corresponding bristles. may exhibit various patterns of different kinds. Very frequently the surfaces of the individual cells are indicated on the 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, and con- tain as a matrix their special cell or a process of it. Cuticular membranes may obtain a very considerable thickness, and, by the deposition of calcareous salts, a high degree of firmness (cai^apace of Crustacea) so that they acquire the value of skeletal , which, FIG. 22c.—CM, cuticle with bristles in the condition of ecdysis. Cu', newly-formed cuticle (Branchipus).
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