p. 1

Fissurella catilliformis, H.D. Rogers-Jr. Am. Phil. Soc (N. Ser.) vol. 5 p. 332 & vol 6 pl 26 fig. 4

Shell nearly elliptical, slightly subovate, depressed conic, with approximate very regular longitudinal cortae alternated with intervening striae, often very minute, the transverse [concentive?] striae giving a very uniform granulation to the cortae; foramen oval, scarcely inclined; inner margin of the aperture entire.

L 0.5