Turrilites splendens, 572 
Valdani, 567 
Uranoceras, 529 
“uranum, 529 
Variations, develop- 
mental, 420 
spontaneous, 420 
647 
Variations, transmission 
of, 419 
Vermiceras, 410 
spiratissimum, 415 
Vermetus, 588 
Vestinautilus 
540, 602 
pinguis, 541 
Von Baer, 365, 402 
Jhering, 356 
Konincki, 
Wagner, 370 
Walcott, 365, 442, 614 
Weismann, 384, 385, 388 
Whitfield, 472, 476 
Wiirtenberger, 396, 417 
Zitteloceras, 518 
Zoon, 399 
