CLASS GASTROPODA 
71 
Type in United States National Museum, No. 11795. Type locality, 
Santa Barbara, California. 
Range. Monterey, California, to San Geronimo Island, Lower Cali¬ 
fornia. 
It is Enlima bistorta Vanatta and Eulima lowei Vanatta. 
Melanella Columbiana Bartsch, 1917 
Plate 47, fig. 5 
Proceedings of the United States National Museum, 53:324; PI. 41, fig. 5. 
Shell large, rather stout, polished, with a double flexure; when viewed 
with the aperture to the front it shows the early whorls bent backward 
and the succeeding turns flexed to the right. Shell bluish-white, except 
where the dried animal shines through its substance; there is a granular, 
light-brown to buff appearance. First three turns well-rounded, separated 
by a well-marked suture, the remaining turns slightly rounded with 
scarcely defined suture. The posterior termination of the whorl shines 
through the shell and appears as a conspicuous false suture. Surface 
marked by fine lines of growth only. Periphery of the last whorl weakly 
angulated. Base strongly rounded on the left side. Aperture very oblique, 
ovate; posterior angle acute; outer lip short, curved, slightly sinuous, re¬ 
flected over and appressed to the base; parietal wall covered by a thick 
callus. Length, 9.5; diameter, 3 mm. (Bartsch.) 
Type in United States National Museum, No. 207771. Type locality, 
Departure Bay, British Columbia. 
Range. Baranoff Island, Alaska, to Departure Bay, British Columbia. 
Melanella comoxensis Bartsch, 1917 
Plate 47, fig. 4 
Proceedings of the United States National Museum, 53:325; PI. 41, fig. 4. 
Shell broadly conic, with a double flexure, the early portion being 
turned back while the later is turned to the right; bluish-white, polished. 
First two whorls well-rounded, separated by a constricted suture, the rest 
slightly rounded, a little more so on the convex than the concave side, 
marked by exceedingly fine lines of growth and microscopic spiral stria- 
tions and occasional varicial streaks, which appear as an opaque spot in the 
shell. Suture scarcely defined. The posterior limit of the inside of the 
whorls shines through the substance of the shell and appears as a false 
suture. Periphery of the last whorl slightly angulated. Base short, strongly 
rounded. Aperture broadly oval, rather short; posterior angle acute; outer 
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