378 ZOOLOGY. 



surface is smooth, not rugose, wheu 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^ADJ^. 

 LYMNJEA UMBROSA. 



Lymnaxi timhrom, Gould. 

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



LYMN.EA EMARGINATA. 



Lymnaa emarginata, Sat. 

 /7ai.— Lake Oyosa, Washington Territory ; Dr. Cooper. 



LYMNJi^A JUGULARIS. 



Lymnaea jugularia, Say. 

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



PHYSA ELONGATA. 



Physa elonyaia, Sat. 

 Ilab. — 'Seax Puget Sounil ; Dr. Cooper. 



PHYSA HETEROSTROPHA. 



rhysa hfteroslropha, Say. 

 Eab. — Ponds in Washington Territocy ; Dr. Cooper. 



PHYSA BULLATA. 



Physa bullata, Gould, ms. 

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



ANCYLUS CAURINUS, n. s? 



iZa?*.— Black river, near Puget Sound ; Dr. Cooper. 



PLANORBIS CORPULENTUS. 



Planorbis corpuJentua, Say. 

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



PLANORBUS TRIVOLVIS. 



Planorbis trivolvis, Say. 

 Hab. — Kear Vancouver ; Dr. Cooper. 



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



shores." — C. 



PLANORBIS PLANULATUS, n. s. 



Eab. — 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. 



