other to form a knobby, cancellate pattern. Dredged occasionally off the Miami area in 35 to 90 fathoms.
Genus Rimula Defrance 1827
Figure 30d
Off North Carolina to eastern Florida and the West Indies.
1⁄3 inch in length, thin, very delicate. Anal slit in the middle of the anterior slope of the shell and arrow-shaped. Base elongate-oval. Shell 1⁄3 high as long. Sculpture of fine cancellations. Margin finely crenulate. Color translucent-white to cream or rust, generally a deeper shade at the apex. The commonest species of American Rimula, but rare in collections. Dredged 5 to 150 fathoms, especially off the Miami area.
Genus Puncturella R. T. Lowe 1827
Circumpolar; south to Cape Cod; south to the Aleutians.
1⁄2 inch in length, conical, laterally compressed, with an elliptical base. 21 to 26 primary radial ribs between each of which are added a smaller, secondary rib farther down. Margin crenulate. Tiny slit just anterior to the apex, and internally it is bordered by a funnel-shaped cup on each side of which is a minute, triangular pit. Color uniformly white, internally glossy. May be collected under rocks at lowest tides in its northern range but also occurs in waters over a mile deep. Common.
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Figure 30. Pucturellas. a and b, Puncturella cucullata Gould; 3⁄4 inch (Pacific Coast); c, P. galeata Gould, form major Dall; 3⁄4 inch (Pacific Coast); d, Rimula frenulata Dall; 1⁄3 inch (Florida).
