﻿647 



Turrilites splendens, 572 

 Valdani, 567 



Uranoceras, 529 



viranum, 529 



Variations, develop- 

 mental, 420 

 spontaneous, 420 



Variations, transmission 



of, 419 

 Vermiceras, 410 



spiratissimum, 415 

 Vermetus, 588 

 Vestinautilus Konincki, 

 540, 602 



pinguis, 541 

 Von Baer, 365, 402 



Jhering, 356 



Wagner, 370 

 Walcott, 365, 442, 614 

 Weismann, 384, 385, 38! 

 Whitfield, 472, 476 

 Wiirtenberger, 396, 417 



Zitteloceras, 518 

 Zoon, 399 



