36 MOLLUSCA. 
Hetix VaNncouverensis (Lea). 
Testa planulata, late umbilicata, luteo-viridescens : spira anfractibus 
quinque subtus rotundatis : apertura transversa, subcircularts, superné 
depressa ; labro inferne sub-reflexo, superné simplice ; columella brevt, 
callosa. 
Helix Vancouverensis, Lea; Trans. Amer. Philos. Soc., vi. 87, pl. 
23, f. 72; Dr Kay, Nat. Hist. New York, 45; Preirrer, Symbole, 
ii. 41; Monog. Helic. Viv., i. 200; Binney, United States Land Mol- 
lusks, 11. 266, pl. 20. 
Heliz concava, Binney; Bost. Journ. Nat. Hist., 11. 372, pl. 14. 
Animmat abbreviated posteriorly, sub-cylindrical, very light-coloured, 
giving a straw-coloured reflection, sides pearly, marked with longitu- 
dinal lines of coarse, elongated, squameform papille, about eight or ten 
on each side, diminishing in size towards the margin. 
This shell has sometimes been considered as a variety of H. con- 
cava, but since a larger number of specimens have been examined, 
the differences between them are so constant that no doubt can longer 
exist. It is always of a darker colour, and nearly twice as large. It 
is one of many instances where different species of analogous forms 
are found on the two slopes of the Rocky Mountains. 
Found by Mr. Drayton and Dr. Pickering, rather common along 
the Columbia River, Oregon. 
Figure 37, the shell with the animal. 
Hetix stricosa (Gould). 
Testa orbicularis, depressa, scabrata, laté umbilicata, cinereo-grisea vel 
fuscescens, fasciis linearibus volventibus pallide fuscis interdum subtus 
notata: spira anfractibus quinque convextusculis ; ultimo angulato et 
prope aperturam deflexo: apertura circularis ; labro simplict, continuo. 
Helix strigosa, Goutp; Proceed. Boston Soc. Nat. Hist., u. 167. 
