101 
nucleus or embryonic whorls, are white, rather rough, and consist of 
about two turns. The next whorl has flat sides and a square-edged 
shoulder and is divided by a small revolving groove into two revolving 
nodulus riblets with shallow pits, in the interstices. The antepenulti- 
mate and penultimate whorls are convex in form and divided into three 
revolving nodulus riblets by two revolving grooves, with deep, 
rounded pits in the interstices. The convex body-whorl comprises 
nearly two-thirds the entire length of the shell with similar seulptur- 
ing as that of the two preceding whorls, and with the pits more con- 
spicuous above, than below the periphery of the body-whorl. The 
suture is distinct and well impressed. The outer lip is very much 
thickened for such a small shell, its outer edge being faintly denti- 
culated by the revolving ribs and grooves, the inner edge just within 
the aperture bearing 5-denticles. The form of the aperture is oval, 
slightly pointed below; canal short and covered. The base of the 
columella is creased by an umbilical slit. The color is ight or dark 
yellow or brownish, plain or with a single white revolving band at 
the periphery of the body-whorl, covering one and sometimes two of 
the revolving riblets. 
Length, 18; breadth, 8 mm. Habitat, Monterey, Cal. 
This small shell has the general form of O. gracillima, Stearns; 
the coloring of O. lurida as well as that of O. gracillima, and some 
varieties of interfassa, but may be readily separated from other mem- 
bers of the lurida group by the pitted sculpturing. I dedicate it to 
the late Dr. R. E. C. Stearns, in return for many favors of a similar 
kind. 
HELIX VAR. SONOMAENSIS, HEMPH. 
Shell rather small, greatly depressed, umbilicated, of a yellowish 
or buff color, whorls 514, slowly increasing in size, the last flatly 
convex beneath, and not excavated around the umbilicus; umbilicus 
large and deep; suture distinet ; aperture rather small, nearly quadrate 
in form and bearing on its columellar portion a long oblique tooth; 
peristome slightly reflected, crowding but not covering any portion 
of the umbilicus, and bearing on its inner side two small denticles, one 
on the basal, and the other near its upper termination. 
Great diam., 8; height 244 mm. 
Great diam., 7; height 24 mm. 
Habitat, near Healdsburg, Sonoma County, Cal. 
The larger size, more depressed form, lighter color, and larger 
umbilicus, will serve to separate this variety from the other known 
forms of Helix (triodopsis) loricata Gld. 
