MOLLUSCA. 429 



Remarks. This species of Inoceramus is remarkable in that 

 the line of obliquity is directed forward in passing from the beak 

 to the basal margin instead of backward as is .usually the case. 

 The species was established upon a single individual, and it has 

 not been met with in any of the recent collections. 



Formation and locality. Navesink marl, Holmdel (White- 

 field). 



Geographic distribution. New Jersey. 



Family PTBBIIDAE. 



Genus PTERIA Scopoli. 



Pteria petrosa (Conrad). 

 Plate XLIL, Figs. 1-2. 



1853. Avicula petrosa Con., Jour. Acad. Nat. Sci. Phil., 2d ser., 



vol. 2, p. 274, pi. 24, fig. 15. 



1854. Avicula linguiformis Evans & Shumard, Proc. Acad. 



Nat. Sci. Phil. 1854), p. 163. 

 1859. Avicula lingua formis Meek, Hind's Rep. Assin. and Sas- 



kat. Expl. Exped., p. 183, pi. i, fig. 7. 

 1 86 1. Avicula linguaeformis Gabb, Synop. Moll. Cret. Form., 



p. 158 (102). 

 1861. Avicula petrosa Gabb, Synop. Moll. Cret. Form., p. 158 



(102). 

 1864. Pteria linguiformis Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 9. 

 1864. Pteria petrosa Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 9. 

 1876. Pteria linguiformis Meek, Inv. Cret. and Ter. Foss. Up. 



Mo., p. 32, pi. 16, figs, i a-d. 



1879. Pteria linguiformis White, nth Ann. Rep. U. S. Geol. 



and Geog. Surv. Terr., pp. 180, 197, 205. 



1880. Pteria linguiformis Whitf., Geol. Black Hills of Dak., p. 



384, pi. 7, figs. 2, 3. 



1885. Pteria linguiformis Whit., Cont Can. Pal., vol. i, pt. i, 



P. 3i- 



1886. Pteria petrosa Whitf., Pal. N. J., vol. i (Monog. U. S. 



G. S., vol. 9), p. 68, pi. 14, fig. 10. 



