BULLETIN 
OF THE 
Selenites Vancouverenis, var. tenuis, HEMPHILL. 
Shell broadly umbilicated, depressed, nearly planulate ; of a dirty greenish brown 
color; whorls 5, flattened above, more rounded beneath, the last expanding later- 
ally as it approaches the aperture, and crowded with fine oblique stri® ; suture well 
impressed ; aperture rounded, slightly flattened above; peristome simple, hardly 
reflected below. Height 4 inch, breadth „7 inch. 
Napa Co., California. 
The small size, nearly planulate form, and thin, lean body whorl as it emerges 
from the aperture, will serve to distinguish this shell from the other forms of 
concavus found on the West Coast. 
The above is Mr. Hemphill’s description. He refers ali these varieties to 
concavus, but I use the specific name Vancouverensis for all Pacific Region forms, 
Limax Hemphilli. 
Plate III. Fig. 1. 
Length (contracted) 19 mm. Mantle long, 9 mm. End of mantle to end of 
body 9 mm. Foot wide 2 mm. Median tract of foot gray, lateral tracts brown. 
Median area of foot rather wider than either lateral area. Mantle free an- 
teriorly as far as respiratory orifice. Body tapering posteriorly, not carinate. 
Mantle somewhat granulose, not concentrically striate. Color dark brown, 
obscurely marbled with gray ; sides anteriorly grayish and paler. 
Limax Hemphilli, W. G Bınnev, 3d Suppl. T. M. V., p. 205, Plate VIII. Fig. E; 
Plate I. Fig. 13; Plate II. Fig. 3 (1890). 
A species of the Pacific Province, having been found from British Columbia 
to San Tomas River, Lower California, by Mr. Henry Hemphill, in whose 
honor it is named. 
The general outward appearance of this species resembles that of campestris, 
but every specimen examined by me from numerous localities had a peculiarity 
in its lingual dentition which seems to me of specific value, — the presence of 
an inner cutting point to the lateral teeth, very much the same as is found in 
agrestis. The anatomy of this species is specifically distinct from agrestis in 
wanting the trifurcate penis sac of the latter, even did its distribution not 
preclude its being a form of agrestis. Ihave ventured therefore on giving it a 
specific name. 
The penis sac is large, long, gradually tapering to the apex; the genital 
bladder ıs globular, on a short, stout duct. 
I figure on the plate a variety from San Tomas River, Lower California, 
called pictus by Mr. Cockerell. Its body is pale, reticulated with gray spots; 
mantle with black or gray spots. Resembling L. Berendti, Strebel, from 
Guatemala. 
For lingual dentition, ete., see Third Supplement. 
