518 
Tympanotomus, 243. 
Types, 49. 
Typhis, 27, *213. 
Umbo, 29, *398. 
Umbonal area, 404. 
Uncini, 21. 
Uncites, *374. 
Unguiculate operc., 207. 
Ongula, 392. 
Ungulina, *458. 
Umbilicated shells, 205. 
Umbrella, *323. 
Unicardium, *457. 
Unio, 29, 30, 33, 109, *433. 
Unio. 497. 
Unio, distribution, 87. 
Unionide, *432. 
Unionttes, 468. 
United States shells, 85. 
Utriculus, 317. 
Vaganella, *479, 
Vagina, 487. 
Vaginella, *349. 
Vaginulus, *300. 
Valvata, *260. 
Vanicoro, 237. 
Varices, 13, 
INDEX. 
Varieties, 46. 
Varigera, *314. 
Varix, 35. 
Velates, #261. 
Velietia, 286, *302. 
Velorita, *463. 
Velutina, 55, *237. 
Venericardia, *472, 
Veneride, *472. 
Venerupis, *476. 
Venilia, 337. 
Venus, 56, *473. 
Verania, 171. 
Vermetus, 7, 36, *249. 
Veronicella, *300. 
Vertebrata, 1. 
Verticordia, *472. 
Vertigo, *293. 
Vibex, *247. 
Villiersia, 329. 
Viquesnelia, *298, 
Vitrina, *290. 
Vitrinella, *265. 
Viviparous reproduction, 
40 
Viviparus, 257. 
Vola, 412. 
Volupia, *473. 
Voluta, 32, 55, *230. 
Volutella, 239. 
Volutide, #229. 
Volutilithes, *230, 
Volva, 234. 
Volvaria, *232. 
Volvula, *315. 
Vulsella, 55, *416. 
Waldheimia, 19, 357, *364. 
Waltonia, *368. 
West African province, 69, 
West American shells, 77. 
West Indian shells, 84. 
Woodwardia, 269. 
Xanthonella, 316. 
Xenophorus, 254. 
Xiphoteuthis, *175. 
Xylophaga, *506. 
Xylotrya, *507. 
Yetus, 231. 
Yoldia, 55, *428. 
Zaria, 248. 
Zellania, *368. 
Zephrina, 337. 
Zierlania, 231. 
Zirfed, 505. 
Zonites, 289, 
Zua, *292, 
