£22 PALEONTOLOGY OF NEW JERSEY. 
frequently shows on part of a volution only, while on the remaining parts 
the callous portion is preserved. In the form and proportion of the callus 
in the umbilicus the same variations are seen that show on the living shells. 
Formation and locality: In the gray micaceous marls of the Miocene at 
Shiloh and Jericho, N. J. From the collections of the National Museum. 
Family CALYP'TRAXID4. 
Genus CRUCIBULUM Schum. 
CRUCIBULUM COSTATUM. 
Pl. xxl, figs. 11-14. 
Calyptrea costata Say: Am. Jour. Sci., Ist. ser., vol. 2, p. 40. 
Dispotea costata Say: Jour. Acad. Nat. Sci., Phila., Ist ser., vol. 4, p. 132; Conrad, 
Miocene Foss. p. 79, Pl. xiv, fig. 2. 
Crucibulum (Dispotea) costatum Conrad: Proc. Acad. Nat. Sci., Phila.. 1862, p. 568, 
where he cites Silliman’s Journal, vol. 11, p. 40, instead of vol. 2, p. 40, typo- 
graphical error by using figures in place of Roman numerals. 
Crucibulum costatum Meek: Check List Miocene Foss., p. 15; Heilprin, Proce. Acad. 
Nat. Sci., Phila., 1887, pp. 399 and 404. 
Calyptrea pileolus H. C. Lea: Trans. Am. Phil. Soe., vol. 9, 22, Pl. xxxv, fig. 38. 
Crucibulum dumosum Tuomey and Holmes, Plio. Foss. 8. Carolina, p. 109, Pl. xxv, 
fig. 6, and not their C. costatwm. 
? Hipponyx Bullii Tuomey and Holmes, loc. cit., p. 112, Pl. xxv, fig. 13 and13a. Inner 
cup only. 
“Oval, convex, with numerous slightly elevated, equal equidistant 
coste, and crowded obtuse, concentric lines, which are regularly undulated 
by the coste; apex mamillated inclined to one side; immer valve patellitorm, 
dilated, attached by one side to the side of the shell, acutely angulated at 
the anterior junction, and rounded at the posterior junction, and rapidly 
tapering to an acute tip, which corresponds with the apex of the shell.” 
(Say in American Journal of Science, loc. cit.) 
Different specimens of this shell vary greatly in the degree of elevation, 
in the number and strength of their ribs, in size and in the form of the inner 
cup or process. This latter feature is perhaps the most perplexing one of 
the species, being in some cases a complete cup atta ched along a narrow 
