99 



SYSTEMATIC LIST 



OP THE 



BEITISH LAND AND EEESHWATEK 

 MOLLUSCA. 



I. AQUATIC. 



BIYALYES. 



(Conchifera.) 

 Lamellibranchiata. 

 FAM. SPH^RIID.JS. 



Sphcerium corneum, 42. 



rivicola, 42. 



ovale, 43. 



lacustre, 43. 



Pisidium amnicum, 43. 



fontinale, 43. 



pusillum, 43. 



nitidum, 43. 



roseum, 43. 



FAM. UNIONID^E. 



Unio tumidus, 35, 36. 

 pictorum, 35, 36. 

 margaritifer, 35. 



UNIYALYES. 



(Gasteropoda). 

 FectinibrancMata. 

 FAM. NERITID^!. 

 Neritina fluviatilis, 18, 55. 



Paludina contecta, 13, 55. 



vivipara, 13, 55. 

 Bythinia tentaculata, 52. 



leacMi, 52, 53. 

 Hydrobia, similis, 52, 53. 



ventrosa, 54. 



FAM. YALVATIDJB. 



Valvciita piscinalis, 51, 56. 

 cristata 



H 2 



