122 PALEONTOLOGY OF NEW .JERSEY. 



frequently shows on i)art of a volution only, while on the remaining- parts 

 the callous portion is preserved. In the fonii and [n-oportion of the callus 

 in the umbilicus the same variations are seen that show on the living shells. 

 FoniKifion <nid /ocaliti/: In the grav micaceous marls of the Miocene at 

 Shiloh and Jericho, N. J. From the collections of the National Museum. 



Family CALYPTR^EID^E. 



Geiuis CRUCIBULUM Schniu. 



Cbucibitlttm costatum. 



PI. XXII, tis's. 11-14. 



Calyptrna costata Say: Am. Jour. Sci., 1st. ser., vol. 2, p. 40. 



Dispotiea costata Say: Jour. Acad. Nat. Sci., Pbila., 1st ser., vol. 4, p. 132; Conrad, 



Miocene Foss. p. 79, PI. xiv, lig. 2. 

 Grucibulum (Dispot(va) costatum Conrad: Proc. Acad. Nat. Sci., Phila.. 1862, p. 568, 



where lie cites Sillimau's Journal, vol. 11, p. 40, instead of vol. 2, p. 40, tyi>o- 



graphical error by using figures in place of Roman numerals. 

 Grucibulum costatum Meek: Che(!k List Miocene Foss., p. 15; Heilprin, Proc. Acad. 



Nat. Sci., Phila., 1887, pp. 390 and 404. 

 Calyptrwa pileolus H. C. Lea: Trans. Am. Phil. Soc, vol. 9, 22, PI. xxxv, fig. 38. 

 Vruvibulum dumosum Tuoniey and Holmes, Plio. Foss. S. Carolina, p. 109, PI. xxv, 



tig. 6, and not their (J. costatum. 

 ? Hippouyx Bulla Tuomey and Holmes, Inc. cit., ]>. 112. PI. xxv, tig. 13 and 13a. Inner 



cup only. 



"Oval, convex, with numerous slightly elevated, equal equidistant 

 costae, and crowded obtuse, concentric lines, which are regularly undulated 

 by the costse; apex mamillated inclined to one side; inner valve patelliform, 

 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 com})lete cup attached along a narrow 



