MULLUSCA OF MICHIGAN— WALKER. 531 



Page. 



Tridentata, Polygyra 462 



Tridcntata, Triodopsis 462 



Tridentata, Vertigo 518 



Tridentata fraudulenta, Polygyra 463 



Triodopsis 461 



Unidentata, Pupa 514 



Vallonia , 520 



Valloniid^ 519 



Vasopulmonata 459 



Ventricosa, Isthmia 517 



Ventricosa, Vertigo 517 



Ventricosa elatior, Vertigo 517 



Vermeta, Succinea 503 



Vertigo 514 



Vertigopsis 511 



Vertilla 515 



Virgata, Helicella 524 



Virgo, Strobilops 506 



Viridulus, Zonites 478 



Vitrea 476 



VlTRINA 475 



Wheatleyi, Vitrea 478 



Wheatleyi, Zonites 478 



Zaleta, Helix 466 



Zaleta, Polygyra 466 



ZONITID^ 473 



ZONITIN^ 474 



zonitoides 483 



Zoogenites 507 



