CLASS GASTROPODA 
73 
anteriorly. Aperture oblique, broadly oval; posterior angle very acute; 
outer lip strongly protracted between the base and the posterior angle, the 
greatest extension falling at the periphery; inner lip oblique, slightly sinu¬ 
ous, reflected over and appressed to the base; parietal wall covered with a 
strong callus. Length, 6; diameter, 2 mm. (Bartsch.) 
Type in United States National Museum, No. 216820. Type locality, 
off Del Monte, Monterey, California. 
Range. Monterey Bay to Catalina Island, California. 
Melanella grippi Bartsch, 1917 
Plate 45, fig. 5 
Proceedings of the United States National Museum, 53:327; PI. 42, fig. 5. 
Shell elongate-conic, moderately stout, double flexed; the anterior por¬ 
tion is turned to the right, while the tip is bent backward; polished, marked 
by exceedingly fine lines of growth only; milk-white, except where the 
dried animal shines through the texture of the shell where it appears yel¬ 
lowish-brown, . or where varices cross the whorls, behind which there is 
always an opaque area. First five whorls well-rounded, separated by a 
somewhat constricted suture, the remaining, moderately rounded, a little 
more so on the convex side than the concave. Summit of the whorls ap¬ 
pressed, separated by a very ill-defined suture. The posterior termination 
shows conspicuously through the substance of the shell on the inside of 
the whorls and appears as a false suture. Last whorl somewhat inflated. 
Periphery moderately protracted. Base rounded. Aperture ovate; posterior 
angle acute; outer lip protracted at the periphery; inner lip short, slightly 
curved, reflected and appressed to the base; parietal wall covered by a 
moderately thick callus. Length, 8; diameter, 2.6 mm. (Bartsch.) 
Type in United States National Museum, No. 203665. Type locality, 
Newport, California. 
Range. San Pedro, California, to Point Abreojos, Lower California. 
Melanella catalinensis Bartsch, 1917 
Plate 42, fig. 7 
Proceedings of the United States National Museum, 53:329; PI. 40, fig. 7. 
Shell elongate-conic, slender, doubly flexed, the main flexure being 
turned to the right, while the extreme tip is slightly bent backward; bluish- 
white, polished. First two whorls well-rounded, separated by a well-con¬ 
stricted suture, the rest moderately rounded on the convex, and slightly 
so on the concave side of the spire, separated by a scarcely defined suture. 
The posterior limit of the whorls shines through the substance of the 
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