664 



INDEX OF GENERA. 



[UNI. — ZYG. 



PAGE. 



Unio, 515 



Unitrypa, 329 



Uphantfenia, / 166 



Valvclina, / 167 



Vanuxemia, / 515 



Vasocrinus, in 287 



Vaticinodus, m 613 



Venus, 516 



Venustodus, m 613 



Vermipora, / 207 



Vertumnia, / 516 



Vesicularia, f 208 



PAGE. 



Vitulina, / 387 



Volkmannia, m .... 148 



Walchia, / 148 



Walcottia, f 522 



Waldheimia, f 387 



Whittleseya, / 148 



Worthenopora, f . . . . 330 



Xenocrinuk, ;/* .... 287 



Xenoneura, / 581 



Xenopfiora, / 430 



Xylobius, m 574 



PAGE. 



Xystracanthus, m . . . 614 

 Xystrodus, in 614 



Yoldia, / 516 



Zaphrentis, / 208 



Zaptychius, m 430 



Zatrachys, n 627 



Zeacrinus, m 288 



Zittelella, / 167 



Zonites, m 430 



Zygospira, / 388 



