PACIFIC COAST SPECIES. 139 



Santa Cruz Island, San Miguel Island, Santa Eosa Island, in the 

 California Region; not in Oregon, as erroneously stated. 



Animal long and slender, smoky white, covered with white, coarse 

 granulations running longitudinally down the back, one line of granu- 

 lations very prominent and central, bordered on either side by a deep 

 furrow; also oblique lines of granulations running down the side of 

 the foot; foot dirty white below; tail short, broad, pointed. Some 

 individuals are darker, with a purplish tinge. 



The usual color of the shell is a light chestnut, bat from San Miguel 

 Island I have a large iudividual (30'""') of a very dark hue. The shell 

 is sometimes bandless. 



The epiphr-figm is white, thick, membranous. 



My description and figure are drawn from an authentic specimen. 



Jaw as usual; 5 ribs. 



The lingual membrane (Terr. Moll., Y, Plate IX, Fig. H) has 50-1-50 

 teeth, with 15 perfect laterals. The outer laterals have a long inner 

 cutting point, but no side cutting point. 



Genitalia as in A. Trasli. The flagellate extensions of the vaginal 

 prostate beyond the bulbs in this species are, however, much shorter 

 and stouter. 



Arionta. ttidiciilata, Bixney. 



Shell subumbilicated or imperforate, orbiculate-convex ; epidermis 

 olivaceous ; spire a depressed cone ; whorls be- ^2i."^" 



tween 5 and 6, slightly convex ; body-whorl vo- 

 luminous, expanding somewhat towards the aper- 

 ture; aperture transverse, rather circular; peri- 

 stome whitish, thin, expanded, slightly reflected 

 at the basal portion, at the columella dilated, ^. tudicuuu^ 



reflected, and aluiost closing the umbilicus; base convex; a well- 

 defined, rather wide, dark chestnut band, margined with a light 

 color above and below, revolves near the the center of the body- whorl, 

 and is more or less visible above the suture on the two whorls preced- 

 ing the last; surface of the outer whorl covered with somewhat reg- 

 ular impressions or indentations, with ridges between, causing it to 

 look as if covered with scales; Avhen these are not ap])areut it is 

 marked with oblique wrinkles. Greater diameter 33, lesser 26'""' ; 

 height lO'"'". 



