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 LYMNtEADJ^. 

 LYMN.EA UMBROSA. 



Lymnaa utnbrosa, GonLD. 

 flab. — Lake Oyosa., on the Okanagan river, near lat. 49°; Dr. Cooper. 



LYMN^^A EMARGINATA. 



Lymnrca emarginata, Sat. 

 Httb. — Lake Oyosa, Washington Territory; Dr. Cooppr. 



LYMNiEA JUGULARIS. 



Lymnaa jugularis, Sat. 

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



PHYSA ELONCxATA. 



Physa elongatttf Sat. 

 Hah. — Near Puget Sound ; Dr. Cooper. 



PHYSA HETEROSTROPHA. 



Physa hetcrostropha, Sat. 

 Hab. — Ponds in Washington Territory ; Dr. Cooper. 



PHYSA BULLATA. 



Physa buUata, Goni.D, MS. 

 Ho!).— 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 TRIVOLVIS. 



Planorbis trivolvis, Sat. 

 Hab. — ^Near Vancouver ; Dr. Cooper. 



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

 shores." — 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. 



