REPOET ON THE TUNICATA. 
429 
“ Triton ” Expedition, 52, 57. 
TylolraTichion, 151, 152, 157, 383, 390, 391. 
„ speciosum, 17, 19, 20, 157, 164, 169, 
170, 354, 359, 363, 367, 372, 375, 
376, 383 (PL xxii.). 
United States Commission of Fish and Fisheries, 288. 
Urochord, 61. 
Vascular appendage, 22, 24, 78, 79, 81, 89, 93, 101, 
254, 386. 
Vas deferens, 23, 394, 395. 
Yerrill, 257, 288. 
Vessels in test, 13, 14, 17, 24, 25, 34, 43, 46, 59, 79, 
97, 397. 
Vertehrata, relationship with, 6. 
Von Drasche, 7, 30, 31, 33, 36, 38, 56, 61, 62, 94, 126, 
127, 135, 136, 149, 150, 186, 200, 215, 254, 
255, 258, 260, 307, 308. 
Wyville-Thomson ridge, 57. 
