474 



SUBJECTS INDEX 



Telolecithal ep;gs, 8. 

 Telotrochse, 271, 275. 

 Terebella, 279, 280, 291. 



Meckelii, 263, 272-274. 

 Terehellidse, 295. 

 Tethya, 34. 

 Tetilla, 34. 

 Tetractinellidee, 32. 

 Tetrastemma, 228. 

 Thalassema, 304-306, 310.^ 

 Thoe, 151. 



Thysanozoon, 160, 166. 

 Tiaridee. 58. 

 Tornaria, 381, 382. 



heart of, 385, 386. 

 Toxopneustes (Fig. 186), 401. 

 Tracheophysse, 59, 65. 

 Trachomedusee, 53, 126. 

 Trematoda, 178. 



derivation of, 201. 



larval membranes of, compared 

 to amnion of Pilidium, 19'^. 



relationships of, to Cestoda, 

 200. 

 Trichina, 234, 243. 

 Trichocephalus affinis, 239. 



dispar, 234. 

 Tricladida, 169, 174. 



Trochophore (Annelida), 266, 341. 



compared to Medusa, 342. 



(Pilidium), 219. 



(Kotatoria), 259. 

 Trochospheera, 259. 

 Trochosphere, 266. 

 Tubifex. 281. 

 Tubipora, 83. 

 Tubularia, 49, 50. 

 Turbellaria, 159. 



relationships of, 176. 

 Turbinaria, 101. 

 Turritopsis, 58. 



Umbrosa, 120. 



Vegetative pole, see Pole, vegeta- 

 tive. 



Velella, 59, 74. 



Velellidse, 65, 67. 



Versuridae, 121. 



Von Baer's cavity, see Cleavage 

 cavity. 



Zoantharia, 88, 100. 

 Zoantheffi, 94. 

 Zoanthus, 100. 

 Zonactinia, 100. 



