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^EAD^E. 

 LYMNJEA UMBROSA. 



Lymnita umbrosa, GODLD. 

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



LYMN^EA EMARGINATA. 



Lymncea emarginata, SAT. 

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



LYMNCEA JUGULARIS. 



Lymncea jugularis, SAT. 

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



PHYSA ELONGATA. 



Physa elongata, SAT. 

 Hab. Near Puget Sound ; Dr. Cooper. 



PHYSA HETEROSTROPHA. 



Physa heterostropha, SAT. 

 Hab. Ponds in Washington Territory ; Dr. Cooper. 



PHYSA BULLATA. 



Physa bullata, GOULD, MS. 

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



ANCYLUS CAURINUS, n. s. ? 



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



PLANORBIS CORPULENTUS. 



Planorbis corpulentus, SAT. 

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



PLANORBIS TRIYOLY1S. 



Planorbis trivolvis, SAT. 

 Hab. Near Vancouver ; Dr. Cooper. 



&quot;Exceedingly abundant in shallow lakes about Yancouver, the dead shells lining the 

 shores.&quot; C. 



PLANORRIS PLANULATUS, n. s. 



Hab. 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. 



