348 LAND AND FRESHWATER MOLLUSCA OF MANITOBA. 



P. gyrina ? Say. — " Small specimens of a Physa resembling the 

 P. elliptica of Lea \^=^P. gyrina Say ?], but possibly distinct 

 herefrom, were found in ponds at York Factory " (Bell). 



Bulinus hypnorum Linn. — A very common shell in lakes 

 and sleughs. Carberry, Brandon, Fort Ellice, Birtle, &c., 

 &c. Pembina Mountain, &c. (Dawson). " This species 

 occurs in ponds all the way from Manitoba to York 

 Factory " (Bell). 



Planorbis trivolvis Say. — A fairly abundant and well dis- 

 tributed species. I found it in most lakes, but not in all, 

 throughout the country. Lake of the Woods; Dufferin, &c. 

 (Dawson). "Some very large specimens of this were 

 collected in the Echimamish River on the west side of the 

 Height of Land. Although common in ponds, rivers, and 

 marshes to the south and west, it was not observed to the 

 northward of this locality " (Bell). 



P. bicarinatus Say. — "A pecuHar variety of this species 

 occurs in Lake Manitoba " ; Lake Winnipeg (Bell). 



P. complanatus Say. — "Abundant in Lake Winnipeg and in 

 the Red and Nelson Rivers " (Bell). 



P. corpulentus Say. — Lake of the Woods (Dawson). 



P. exacutus Say. — Common in many of the lakes and ponds 

 between Birtle and Rapid City, but not in all ; ponds near 

 Beaver Creek ; Pine Creek. Not seen near Carberry or 

 Brandon. 



P. parvus Say. — Exactly the same as the last species. 



P. umbilicatus Taylor, n. sp.— Found in ponds betweeu 

 Rapid City and Birtle ; also near Brandon. 



Segmentina armigera Say.— A few from Pine Creek; 



* common in some lakes and sleughs near Birtle, Fort Ellice, 

 Two Creeks, &c., but not in all; abundant in a lake at 

 High-bluff ; not seen near Carberry or Brandon. Several 

 localities in Manitoba (Dawson). " In ponds between 

 Forts Ellice and Pelly ; abundant in Great Playgreen 

 Lake " (Bell). 



J.C, iv., July, 1885. 



