ntc 



Fig. 45. — Hydra. A vertical section of entire animal; E, portion of transverse 

 section, highly magnified ; C, two large ectoderm cells ; D, endoderm cell of 

 H. inridis ; E, large nematocyst; F, small nematocyst; G, sperm; a, ingested 

 diatom; bd. 1 , bd. 2 , buds; chr, chromatophores; cub/, cnidoblast; enc, cnidocil ; 

 ect, ectoderm ; cud, endoderm; cut. cav, enteric cavity; ent. cav 1 , its prolonga- 

 tion into the tentacles; J7, flagellum; hyp, hypostome or manubrium; int. c, in- 

 terstitial cells; m.ftr, muscle processes; mtli, mouth; wsg!, mesoglcea; ?ict, 

 large, and ate 1 , small nematocysts; mi, nucleus; ov, ovum; ovy , ovary; psd, 

 pseudopods; spy, spermary ; vac, vacuole. 



