TABLE OF CONTENTS. XI 



INVERTEBRATE l'AL.Ei >NTt tl.OCY -Continued. 



Cretaceous Species, 

 molixsca. 

 Cephalopoda. 



Dibrancbiata. Page 



Tenthidie 505 



Gains Phyllotenthis 505 



AliTIClLATA 506 



Annulate - 506 



Tubicola 506 



Serpulidas 506 



Genus Serpula 506 



Species of the Fresh- and Brackish-water Lignite beds 509 



Mollusca 509 



Lamellibranchiata 509 



llonomyaria 509 



Ostreidaj 509 



Genus Ostrea 509 



Diniyaria 511 



Unionidffi 511 



Genus Unio 511 



Cyrenidas 520 



Genus Corbicula 520 



Spha>riniii 525 



Corbulid;e 528 



Genus Corbula 528 



Gasteropoda 531 



Pulmonata 531 



Limnandse 531 



Genus Limna'a 531 



Planorbis 534 



Pbysidse 540 



Genus Buliuus 540 



Ancyltda? 543 



Genus Acroloxus 543 



Vitrinida? 544 



Gains Vitriua 544 



Hyaliua 545 



Helicidaj 549 



Genus Helix 549 



Tliauniastus 553 



Columna 554 



Pectinibranchiata 558 



Cerithiidie .'. 558 



Genus Ceritbidea 558 



C'eripbasiida; 560 



Genus Goniobasis 560 



Rissoidse 571 



Genus Hydrobia 571 



Micropy rgus 574 



Viviparidse 576 



Genus Viviparus 576 



Campeloma 585 



Valvatidae 589 



Genus Valvata 589 



Fossils of the Wind River Tertiary 593 



MOIXUSCA 593 



Gasteropoda 593 



Pulmonata 593 



