348 
B. N. A. BOUNDARY COMMISSION. 

specimens ; peripheral carination almost obsolete on the last half whorl ; 
aperture roundedly lunate, very oblique, slightly reflexed at the umbilicus, 
so as to interfere somewhat with its circular outline ; peristome acute, 
thickened within ; callus delicate, transparent ; whorls 53 ; suture slightly — 
impressed, becoming more distinct in the last half whorl; surface marked 
with coarse transverse wrinkles, and faint revolving lines, the latter scarcely 
perceptible on the outer whorl ; colour, dull yellowish, with four brownish 
revolving bands, two of which appear pretty constant, and are situated on 
each side of the peripheral carina, which is generally whitish ; the two re- 
maining bands near the suture and umbilicus respectively, fainter and less 
constant. Animal resembles J//. soljaria in general form, pale, with brown- 
ish spots. . 
Greatest diameter 17 mm. ; least diameter 14 mm.; height11mm. Young 
specimens only 4 mm. in diameter are very strongly carinated, and flattened 
above ; semi-transparent, brownish-tawny in colour ; delicately marked with 
close revolving and transverse lines. 
This shell is closely allied to Heliz solitaria, but is smaller, darker coloured 
and rougher, more distinctly carinated, especially in young specimens ; the 
shell is also somewhat thicker, the umbilicus is narrower, and the lip en- 
croaches slightly on its circular outline, 
Loc, Waterton Lake. Rocky Mountains. 
Vitrina limpida, Gould. Lake of the Woods. Turtle Mountain. Wood Mountain 
Hyalina arborea, Newcomb, Lake of the Woods. Dufferin, Turtle Mountain. 
Wood Mountain. 
Hyalina fulua, Draparnaud. Lake of the Woods. Pembina Mountain. Turtle 
Mountain. Wood Mountain. 
Hyalina viridula, Menke. Lake of the Woods. Dufferin. Pembina Mountain. 
Turtle Mountain. Wood Mountain. ! 
Succinea obliqua, Say. Lake of the Woods. Dufferin. Pembina Mountain. Turtle 
Mountain. Many specimens showing a decided approximation to S. Tot- 
teniana, but with intermediate forms, 
Succinea avara, Say. Lake of the Woods. Corresponds exactly with Say’s descrip- 
tion and eure, but many of my specimens exceed 6 mm., the largest 
measuring 9: 5 by 5 mill. 
Succinea ovalis, Gould. Lake of the Woods. 
Suceinea Haydeni, var minor, Binney. Pembina Mountain. 
Succinea lineata, Binney. 30 miles E. of Wood Mountain. 20 miles 8. of Wood 
Mountain. The specimens agree pretty closely with this species, and appear 
to belong to it, though they do not show any distinct revolving lines. The 
callus is very delicate. The agreement with Binney’s figure is more satis- 
factory than with the de ‘scription, my specimens having the aperture longer 
than half the length of the shell ; shell solid, amber coloured, to greenish- 
yellow. 
Cionella sub-cylindrica, Lin. Lake of the Woods. Dufferin. Pembina Mountain. 
Turtle Mountain. Wood Mountain. 
Pupa.—Near Saline Lake, east of Turtle Mountain. (One specimen only, im- 
mature.) 
LIMN AID 
Limnea stagnalis, Lin. Lake of the Woods. Pointe du Chéne. Dufferin. Long 
River. The specimens from the prairie region are often very well grown 
and robust, the shell being thick and showing strong growth-lines. Some 
specimens from pools at Dufferin measured 56 by 26 mm, 
Limnea elodes, Say, Lake of the Woods. Pools and swamps of the Red River 
prairie. Pembina River. Saline Lake, east of Turtle. Mountain. Turtle 
Mountain. Riviere des Lacs. Souris River. Pools near Traders’ Road. 500 
Mile Lake, Creek near Kast Fork Milk River. Pool 30 miles west of West 
