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FISSURELLIDAE 95
other to form a knobby, cancellate pattern. Dredged occasionally off the
Miami area in 35 to 90 fathoms.
Rimula frenulata Dall
Genus Rimula Defranee 1827
Off North Carolina to eastern Florida and the West Indies.
Bridle Rimula
Figure 3od
Vs inch in length, thin, very dehcate. Anal slit in the middle of the
anterior slope of the shell and arrow-shaped. Base elongate-oval. Shell Vs
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.
Puncturella noachina Linne
Genus Fimcturella R. T. Lowe 1827
Circumpolar; south to Cape Cod; south to the iVleutians.
Linne's Puncturella
V2 inch in length, conical, laterally compressed, with an elliptical base.
21 to 26 primary radial ribs between each of which are added a smaller, sec-
ondary 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.
Figure 30. Pucturellas. a and b, Pimctiirella ciicuUata Gould; % inch (Pacific
Coast); c, P. galeata Gould, form major Dall; % inch (Pacific Coast); d, Rimula
frenulata D3.\\; % inch (Florida),