420 



INDEX. 



PAGE 



III 105 



Vorticifex, Meek, 



Yulpecula, Blainville. II 171 



Yulsella, Lamarck. Ill 280 



Yulsellina, Raincourt.III 281 



Yulsellinge. ... Ill 280 



Waagenia, Bayle. . II 78 



Waagenia, Neumayr. II 82 



Waagenia, Koninck. II 322 



Waldheimia, King. Ill 309 



Waltonia, Davidson. Ill 311 



Warnea, Gray. . . Ill 118 



Warthia, Waagen. . II 322 



Wiiitfieldia,Davidson.III 324 



Whitneya, Gabb. . II 118 



Wilkinsonsea. . . II 292 



Woodia, Deshayes. Ill 229 



Woodwardia, Fischer. II 320 



Wyvillea, Watson. II 165 



Xantliomelon,Albers. Ill 43 



Xantlaonella, Gray. II 353 



Xanthonyx, Cr. & P. Ill 57 



Xenophora, Fischer. II 216 



Xerocampylsea, Kob. Ill 41 



Xeroleuca^ Kobelt. Ill 38 



Xerophila, Held. .Ill 37 



Xesta, Albers. . . Ill 26 



Xestina, Pfr. . . Ill 26 



Xiphoteuthis, Huxley. II 47 



Xiphoteuthis, Owen. II 37 



Xolotrema, Raf. . Ill 34 



Xylohelix, Chemn. II 224 



Xylophaga, Turton. Ill 125 



Xylophagella, Meek. Ill 126 



Xylotria, Leach. . Ill 123 



Yetus, Gray. . . . 



II 



162 



Yoldia, Moller. . . 



III 



249 



Zafra, A. Ad. . . 



II 



185 



Zaphon, H. & A. Ad. 



II 



157 



Zaria, Gray. . . . 



II 



224 



Zebina, H. & A. Ad. 



II 



261 



Zebinella, Morch. . 



II 



261 



Zebra, Shuttl. . . 



III 



58 



Zebrina, Held. . . 



III 



50 



" " . 



III 



54 



Zeidora, Adams. 



II 



328 



Zeilleria, Bayle. . . 



III 



309 



Zellania, Moore, 



III 



313 



Zemira, H. & A. Ad. 



II 



152 



Zenatia, Gray. . . 



III 



159 



Zenobia, Gray. . . 



III 



39 



Zephyrina, Quatr. . 



II 



383 



Zeuxis, H. & A. Ad. 



II 



157 



Ziba, H. & A. Ad. . 



II 



168 



Zierliana, Gray. 



II 



170 



Zilotea, Raf. . . . 



III 



87 



Zingis, Martens. 



III 



26 



Zippora, Leach. . . 



II 



263 



Zirfasa, Gray, . . 



III 



126 



Zirphsea, Leach. 



III 



126 



Zittelia, Gemra. . . 



II 



180 



Zizyphinus, Gray. . 



II 



312 



Zonitarion, Pfr. 



III 



22 



Zonites, Montfort. , 



III 



22 



ZonitidiB 



III 



22 



Zonitoides, Lehm. . 



III 



23 



Zonyalina, Martens. 



III 



23 



Zoogenites, Morse. 



III 



29 



Zospeum, Bourg, . 



III 



72 



Zua, Leach, . . . 



III 



63 



Zurama, Leach. . . 



III 



39 



Zygospira, Hall, 



III 



319 



