518 



nfDEX. 



Tympanotomus, 243. 

 Types, 49. 

 Typhis, 27, *213. 



Umbo, 29, *39S. 

 Umbonal area, 404. 

 TJncini, 21. 

 Uncites, *374. 

 Unguiculate operc, 207. 

 Ungula, 392. 

 Ungulina, *458. 

 Umbilicated shells, 205. 

 Umbrella, *323. 

 Unicardium, *457. 

 Unio, 29, 30, 33, 109, *433. 

 Unio. 497. 



Unio, distribution, 87. 

 Unionidffi, *432. 

 Unionites, 468. 

 United States shells, 85. 

 Utriculus, 317. 



VaganeUa, *479. 

 Vagina, 487. 

 Vaginella, '^349. 

 Vaginulus, *300. 

 Valvata, *260. 

 Vanicoro, 237. 

 Varices, 13. 



Varieties, 46. 

 Varigera, *314. 

 Varix, 35. 

 Velates, ♦261. 

 Velietia, 286, *302. 

 Velorita, *463. 

 Velutina, 55, *237. 

 Venericardia, *472. 

 VeneridEe, *472. 

 Venempis, *476. 

 Venilia, 337. 

 Venus, 56, *473. 

 J'erania, 171. 

 Vermetus, 7, 36, *249. 

 Veronicella, *300. 

 Vertebrata, 1. 

 Verticordia, *472. 

 Vertigo, *293. 

 Vibex, *247. 

 Vil/iersia, 329. 

 Viquesnelia, *298. 

 Vitrina, *290. 

 Vitrinella, *265. 

 Viviparous reproduction, 



40. 

 Viviparus, 257. 

 Vola, 412. 

 Volupia, *473. 

 Voluta, 32, 55, *230. 

 Volutella, 230. 



Volutidae, *229. 

 Volutilithes, *230. 

 Volva, 234. 

 Volvaria, *232. 

 Volvula, *315. 

 VulseUa, 55, *416. 



Waldheimia, 19, 357, *364. 

 Waltonia, *368. 

 West African province, 69. 

 West American shells, 77. 

 West Indian shells, 84. 

 Woodwardia, 269. 



Xanthonella, 316. 

 Xenophnrus, 254. 

 Xiphoteuthis, *175. 

 Xylophaga, *506. 

 Xylotrya, *507. 



Yetus, 231. 

 Yoldia, 55, *428. 



Zaria, 248, 

 Zellania, *368. 

 Zephrina, 337. 

 Zierlania, 231. 

 Zirfoea, 505. 

 Zonites, 289. 

 Zua, *292. 



