378 ZOOLOGY. 



surface is smooth, not rugose, when alive, as represented in Dr. Binney's plate, and its color 

 is a pale yellowish olive, usually more or less irregularly blotched with black. C. 



Family LYMN^AD^E. 

 LYMNCEA UMBROSA. 



Lymncea umbrosa, GODLD. 

 Ilab. Lake Oyosa, on the Okanagan river, near lat. 49 ; Dr. Cooper. 



LYMNJEA EMARGINATA. 



Lymncea emarginata, SAY. 

 Hob. Lake Oyosa, Washington Territory ; Dr. Cooper. 



LYMNJ3A JUGULARIS. 



Lymncea jugularis, SAY. 

 Hob. Lake Oyosa, Washington Territory ; Dr. Cooper. 



Physa elonyata, SAY. 

 Sab. Near Puget Sound ; Dr. Cooper. 



PHYSA ELONGATA. 



PHYSA HETEROSTROPHA. 



Physa heterostropha, SAY. 

 Sab. Ponds in Washington Territory ; Dr. Cooper. 



PHYSA BULLATA. 



Physa buttata, GOULD, MS. 

 Sab. Lake Oyosa, Washington Territory ; Dr. Cooper 



ANCYLUS CAURINUS, n. s? 



Hob. Black river, near Puget Sound ; Dr. Cooper. 



PLANORBIS CORPULENTUS. 



Planorbis corpulentus, SAY. 

 Hab. Lake Oyosa, Okanagan river; Dr. Cooper. 



PLANORBUS TRIYOLVIS. 



Planorbis trivolvis, SAY. 

 Hob. Near Vancouver ; Dr. Cooper. 



"Exceedingly abundant in shallow lakes about Vancouver, the dead shells lining the 

 shores." C. 



PLANORBIS PLANULATUS, n. s. 



Bab. Lakes on Whidby's island ; Dr. Cooper. 



A small carinated species, flat above, convex below, having much the appearance of a 

 valvata, found only in lakes on Whidby's island, at the entrance of Puget Sound. 



