392 



INDEX. 



Tergum, 171, 173, 185, 187. 



Testis of Crab, 205 ; of Cyclops, 230 ; 

 of Earthworm, 144, 149; of Leech, 

 166 ; of Squid, 348, 349. 



Thoracic area, 170. 



Thoracic ganglia, 206; of Crab, of 

 Grasshopper, 264. 



Thorax of Cyclops, 225 ; of Grasshop- 

 per, 238, 246. 



Tibia, 242. 



Tongue, 245. 



Trachea, 259. 



Trivium, 58. 



Trochanter, 240. 



Tubular band, 158. 



Tympanum, 264. 



Umbrella, 39. 



Ungues, 242. 



Unio, gill of, 305. 



Vagina, 166, 263. 



Vas deferens of Crab, 177, 205 ; of Cy- 

 clops, 230; of Earthworm, 150; of 

 Squid, 350. 



Veliger, embryo, 327. 



Velum of Hydro Medusa, 39; of Oys- 

 ter, 329 ; of Squid, 369. 



Venous sinus, 282. 



Ventral nerve chain of Earthworm, 

 148, 157 ; of Grasshopper, 263 ; of 

 Leech, 165. 



Ventricle of Auodonta, 281, 282, 293. 



Ventriculus, 262. 



Vertebral ridge, 60. 



Vesicula seminales, 149, 166, 350, 



Vestibule, 10, 15, 18. 



Vitreous humor, 359. 



Vorticella, iii. : conjugation of, 21 : 

 contractile vesicle of, 19; crop of, 18; 

 cuticle of, 17 ; digestive organs of, 

 ectosarc of, 17 ; encystment of, 22 ; 

 endoplast of, 19 ; endosarc of, 16 ; 

 epistorna of, 15 ; fission of, 20 ; food 

 vacuole of, 19; oesophagus of, 18; 

 peristome of, 14 ; vestibule of, 15, 18. 



Water pouch of Echinoderms, 109 ; 

 system, 68, 69, 76; tube, radial, 

 58, 69, 70, 78, 91, 98 ; tube, circum- 

 oral, 70, 93 ; unio, 306. 



Wings, 238, 239. 



Wing cover, 238. 



Zoea stage of Crab, 207 ; embry- 

 onic, 214. 



31 



