PROCEEDINGS OF THE CONCHOLOGICAL SOCIETY. 



57 



Family VALVATID.E. 

 Genus VALVATA Mull. 

 Valvata piscinalis [Mull.). 

 V. depressa C. Pfr. 

 V. antiqua So%v. 



( = v. subcylindrica t7e/'.). 

 V. acuminata y^. 

 ni. sinistrorsumyi?^. 



Valvata cristata Mull. 

 V. alba Kotve. 



Class ACEPHALA. 

 SuK-cLASS PELECYPODA. 

 Order LAMELLIBRANCHIATA. 

 Sub-order ISOMYA. 

 Family UNIONID/E. 

 Genus UNIO Philippsson. 

 Unio tumidus J^/izl. 

 V. mulleri Kossin. 

 V. ovalis {Mont.). 

 V. ponderosa Pascal. 

 V. radiata Colb. 

 Unio pictorum (Z.). 



V. curvirostris Norm. 

 V. latiory^^ 

 V. conipressay^^; 

 V. radiata Moq. 



Margaritana Schum. 

 Unio margantifer (Z. ). 

 V. sinuata Lam. 

 V. roissyi Mick. 



Genus ANODONTA Lam. 

 Anodonta cygnea (Z.)- 



V. arenaria {Schriiter). 



V. rostrata I\ossm. 



V. stagnalis {Sozo.). 



V. incrassata (6'//fc;/5/. ). 



V. radiata {Midi.). 



V. pallida y'c'^ 

 Anodonta anatina (Z.). 



V. ventricosa C. Pfr. 



V. complanata Possin. 



V. radiata Jeff. 



Family SPH.ERIID^. 

 Genus SPHiERIUM Scop. 

 Sphifirium corneum (Z.). 

 V. pisidioides Gray. 

 V. scaldiana (A'or/u.). 

 V. nucleus {Stud.). 

 V. flavescens QMacglll.'). 



Sphserium rivicola {Leac/i). 

 V. flavescens Aloq. 



Sphserium pallidum Gray. 



( = S. ovale Jeff.). 



Sphserium lacustre {J'l/dl.). 

 V. ryckholtii {Norm.\ 

 V. rotundayi^. 

 V. brochoniana Boiirg. 

 V. ovalis {Fer.). 



Genus PISIDIUM C. Pfeiffer. 



Pisidium amnicum {Mull.'). 

 V. flavescens Moq. 

 V. laeviuscula Moq. 



Pisidium fontinale {Drap.). 

 V. henslowana {Skepp.). 

 v. Y>^\cht\\2.Jenyns. 

 V. cinerea Alder. 

 V. pallida Gassies. 



Pisidium pusillum {Gnielin). 

 V. obtusalis {Lam.). 

 V. grandis Adams. 



Pisidium nitidumy^;;. 

 V. globosa Adams. 

 V. splendens Moq. 



Pisidium milium Held. 



( = P. roseum Jiff.). 

 V. alpestris Clessin. 



Sub-order HETEROMYA. 

 Family MYTILID.E. 

 Genus DREISSENSIA VanBen. 

 Dreissensia polymorpha (Pall.). 

 V. angusta Coll>. 

 V. dilatata Cold. 



