The Notch-side Shells 



cross ribs for the beading of the suture. It is olive or brown, 

 and dull. Look for it under stones as the tide goes out. 



Habitat. — Southern California. 



The Burnt Drillia (D. empyrosia, Dall) shades from yellow 

 to dark brown, the colour deepening toward the latest whorls. 

 The snire is stouter than that of its relatives. Across each whorl 

 obtuse and pale knobs or ridges pass; the suture is outlined with 

 white. The columella is arched decidedly at a point opposite the 

 sutural notch. This species is dredged at some depth off San 

 Pedro, and no shells are washed ashore. The largest are scarcely 

 two inches long. 



D. incisa, Cpr., ashy-hued, with revolving lines of red, 

 resembles D. pencillata, but is half as large. Length, i inch. 



Habitat. — Puget Sound. 



The related genus, Bela, Gray, is a group of spindle shells 

 usually notched, so we may recognise family traits in most of 

 the species. Our dozen or more species are very small, and 

 rare in collections, being for the most part Alaskan, many taken 

 from deep water. 



Genus MANGILIA, Risso 



The spindle shape and narrow, long aperture characterise 

 this group of a dozen west coast species. They are little, and 

 rarely seen, for they are cold water forms for the most part. 



M. merita, Gld., has six whorls crossed by distinct, rounded 

 ribs, intersecting sharp spiral ridges. They are pure white. 

 Length, h inch 



M.variegata, Cpr., with still more prominent longitudinal 

 ridges, is a thin, yellow shell, darkening toward the apex. The 

 pattern is mixed and indistinct. Length, ^ inch. 



Habitat. — Southern California. 



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