INDEX. 



419 



Yelorita, Gray, . Ill 

 Yeloritina, Meek. . Ill 

 Velutella, Gra}'. . II 

 Velutina, Fleming. II 

 Yelutinopsis, Sandb. Ill 

 Venassa, von Martens. II 

 Yeuericardia, Lam. Ill 

 Yeneridse. . . . Ill 

 Yenerinse. . . . Ill 

 Yenerupis, Lamarck. Ill 

 Yeniella, Stoliezka. Ill 

 Yenilia, Aid. & Han. II 

 Yenilia, Morton. . Ill 

 Yenilicardia, Stolicz. Ill 

 Yentricola, Romer. Ill 

 Yentridens, B. & B. 

 Yenulites, Schloth. 

 Yenus, Linn. . . 

 Yenusta, Bottger. . 

 Yerania, Krohn. 

 Yerena, H. & A. Ad 

 Yerena, Gray. . . 

 Yermetidae. . . . 

 Yermetus, Adanson, 



Yermiculus, Daly ell 

 Yermiculus, Lister. 

 Yeronicella, Blainv. 

 Yeronicellidse. . 

 Yertagus, Klein. . 

 Yerticillus, Moq.-Tan.III 

 Yerticordia, S. Wood.III 



III 

 III 

 III 

 III 

 II 

 II 

 II 

 II 

 II 

 II 

 II 

 II 

 III 

 III 

 II 



Yerticordiidse, . . 

 Yertigo, Miiller. 

 Yertilla, Moq.-Tan. 

 Yespertilio, Klein. 

 Yetocardia, Conrad. 



Yexilla, Swainson. 

 Yexillum, Bolt. 

 Yiana, H. & A. Ad 

 Yibex, Oken. 

 Yicaria, d'Arch. 

 Yidena, H. & A. Ad. Ill 

 Yilliersia, d'Orbigny. II 

 Yiquesnelia, Morelet. Ill 



III 

 III 

 III 

 II 

 III 

 III 

 II 

 II 

 II 

 II 

 II 



185 

 185 

 208 

 20T 

 101 

 159 

 233 



ns 



175 

 lU 

 188 

 383 

 188 

 189 

 176 



24 

 225 

 176 



76 



32 

 254 

 223 

 226 

 226 

 227 

 347 

 226 



89 



89 

 247 



22 

 197 

 196 



71 



72 

 164 

 193 

 231 

 112 

 171 

 296 

 254 

 248 



31 

 372 



82 



Yitrea, Fitz. ... Ill 

 Yitrella, Clessin. . II 

 Yitrina, Draparnaud. Ill 

 Yitrinella, C. B. Ad. II 

 Yitrinella, Gray. . Ill 

 Vitrinidaj. . . . Ill 

 Yitrinoconus,Semper.III 

 Vitrinoidea, Semper. Ill 

 Yitrinopsis, Semper. Ill 

 Yitrinozonites,Binn. Ill 

 Yitta, Klein. . . II 

 Yitularia, Swainson. II 

 Yitulina, Hall. . . Ill 

 Yivipara, Montf. . II 

 Yiviparella, Rafinesq. II 



Yola, Klein. 

 Yolborthia, Moller. 

 Yolema, Bolten. 

 Yolupia, Defrance. 

 Yolusia, A. Ad. 

 Yoluta, Lamarck. 



Ill 

 III 

 II 

 III 

 II 

 II 

 II 



Yoluta'xis, Strebel. Ill 

 Yolutella, d'Orbigny. II 

 Yolutella, Swainson. II 

 Yolutharpa, Fischer. II 

 Yolutidse. ... II 

 Yolutifusus, Conrad. II 

 Yolutilithes, Swainson. II 

 Yolutoconus, Crosse. II 

 Yolutoderma, Gabb. 

 Yolutolyria, Crosse. 

 Yolutomitra, Gray. 



II 

 II 

 II 

 II 



Yolutomorpha, Gabb. II 



Yolutopsis, Mcb. 

 Yolva, Bolten. . . 

 Yolvaria, Lamarck. 

 Yolvarina, Hinds. . 

 Yolvatella, Pease. . 



II 

 II 

 II 

 II 

 II 



" " . II 



Yolviceramus, Stolicz. Ill 

 Yolvula, A. Adams. II 

 Yolvulina, Stolicz. II 

 Yortex, Beck. . . Ill 

 Yortex, Moq.-Tan. Ill 



PAGK 



23 



266 



20 



316 



22 



20 



21 



21 



21 



21 



296 



105 



330 



274 



274 



290 



341 



134 



177 



231 



162 



163 



15 



164 



173 



148 



162 



166 



165 



165 



165 



162 



168 



169 



166 



137 



19'9 



174 



173 



353 



362 



279 



359 



359 



33 



41 



