THE NAUTILUS. 



Unio luteolus Lam. Red River. (Christy, Dawson & Taylor.) 

 " multiplicatus Lea. (Christy.) 

 " occidens Lea. ? Red River. 

 " plicatus Lesueur. (Bell & Christy.) 

 " radiatus Lam. (Bell.) 



" rectus Lam. Some large specimens, with beautiful nacre, 

 have been taken from the Red River here. (Christy, Dawson & 

 Taylor.) 



Unio rubiginosus Lea. Common in Red River. (Christy, Daw- 

 son & Taylor.) 



Unio spatulatus Lea. (Red River, by Dawson.) 

 " subovatus Lea. ? (Dawson.) 



" undidalus Barnes. (Christy, Dawson & Taylor.) Appears 

 to be common in Red River. 



Margaritana complanata Barnes. (Bell & Dawson.) 



" rugosa Barnes. (Dawson.) 



Anodonta ferussaciana Lea. Lake of the "Woods. (Dawson.) 

 " footiana Lea. Souris River. (Dawson.) 

 " plana Lea. ? I sent a shell to Mr. Ferriss, which he 

 considered this species. 



Anodonta subcylindracea Lea. (Holland.) 



'' undulata Say. (Bell & Dawson.) 



Valvata tricarinaia Say. Rare here. (Christy & Dawson.) 



" sincera Say. (Christy & Dawson.) 

 Gampeloma decision Say. Rare here. (Lake of "Woods, Dawson.) 

 BythineUa oblusa Lea. "Winnipeg (also by Condray here). 

 Amnicola porata Say . Lake of the "Woods. (Dawson). 

 " pallida Hald. ( Christy & Dawson.) 



" granvm Say. Pine Creek. (Christy.) 



Limncea stagnalis L. I have taken a few dead shells along the 

 Assiniboine River here. Also included in the other lists. 

 Limncea decollata Mighels. Lake of the Woods (Dawson.) 

 " me gasoma Say. Echimamish River (Bell). 

 " palustris Mull. On all the lists. Some shells which I 

 think belong to this species are very prettily lined. This form is 

 rather abundant in some of the marshes. 



Limncea catascopium Say. Lake Manitoba, etc. Also on Daw- 

 son's list. 



Limncea caperata Say. On all the lists. 



