268 



THE HYDRA 



Fig. 130. — Nervous system of hydra as shown by maceration. 



A, sensory cell {s.c?i from ectoderm of tentacle, shown in its relation to supporting 

 lamella (s7.) and cnidoblast (en). B, nerve cell of endoderni in.c), connected with large 

 endoderm cell (en). C, sensory cell of endoderm. D, network composed of nerve cells 

 {n.c.) and neuro-sensory cell (,n-s.c.) from ectoderm of body (cf. Figs. 128 and 129). E, sen- 

 sory cell from ectoderm of hypostome. F, lateral view of two nerve cells and the support- 

 ing lamella (s.L). The processes do not pass through the lamella, although they seemed 

 to do so in this bit of macerated material. G and H, sensory cells from ectoderm of body. 

 /, part of the ring of nerve cells in ectoderm of foot (cf. Fig. 128). J, neuro-sensory cell 

 from ectoderm of body. K, sensory cell (s.c.) and gland cell (g.c.) of foot. L, nerve cells 

 (n.c.) and gland cells (g.c.) of foot. (After Hadzi, loc. cit.) 



