136 



ZOOLOGY 



SECT. 



Clatlirozoon, an Australian genus, resembles it in having branched 

 and intertwined coenosarcal tubes, the perisarc of which under- 



msyt 



' ' ' ' ' ' SCALE FOB A 



"155" "> "> 



ntc 



cnc 



FIG. 94. Hydra. A, vertical section of entire animal; B, portion of transverse section, highly 

 magnified ; C, two large ectoderm cells ; D, endoderm cell of H. viridis ; E, large nematocyst ; 

 F, small nematocyst ; G, sperm ; a, ingested diatom ; bd. 1, bd. ^buds ; chr. chrouiatophores ; 

 cnbl. cnidoblast ; cue. cnidocil ; ect. ectoderm ; end. endoderm ; ent. cav. enteric cavity ; ent. 

 cav'. its prolongation into the tentacles ; fl. fiagellum ; hyp. hypostome or manubriiun ; int. c. 

 interstitial cells ; m. pr. muscle processes ; ruth, mouth ; insyl. mesoglcea ; ntc. large, and ntc'. 

 small nematocysts ; nu. nucleus; of. ovum; ory. ovary ; psd. pseudopods ; spy. spermary, 

 vac. vacuole. 



goes fusion, but the complex mass thus produced, instead of 

 forming an incrustation on a shell, is a large, abundantly branched, 



