Maryland Geological Survey 231 



in N. bellistriata. On comparison with specimens of N. varicosa in the 

 office of the New York State Paleontologist they were found to be very 

 similar and therefore are referred to this species. This species is closely 

 related to N. bellistriata (Con.) ; but is distinguished by its more erect 

 and triangular form, higher beaks, finer concentric striae and numerous 

 strong varices of growth. 



Length, 14-18 mm.; height, 11-13 mm. 



Occurrence. — Eomney Formation, Hamilton Member. East bank 

 Evitts Creek below Wolfe Mill ; and from another place in western Mar}^- 

 land the exact locality of which is not stated; on the Eomney-Hanging 

 Rock Road about i mile north of Romney, W. Va. ( ?). 



Collections. — Maryland Geological Survey; New York State Museum. 



Genus NUCULITES Conrad 



Nugulites oblongatus Conrad 



Plate XXV, Figs. 17-20 



Nuculites oblongatus Conrad, 1841, Geol. Surv. N. Y., An. Rep., p. 50, plate, 



fig. 8. 

 Nuculites oblongatus Hall, 1870, Prelim. Notice Lamellibranchiata 2, p. 4. 

 Nuculites oblongatus Hall, 1885, Pal. N. Y., vol. v, pt. i, Lamellibranchiata ii, 



p. 324, pi. xlvii, figs. 1-12. 

 Nuculites oblongatus Keyes, 1891, Johns Hopkins Univ. Circ, vol. xi, p. 29. 

 Nuculites oblongatus Clarke, 1903. N. Y. State Mus., Bull. 65, p. 465. 

 Nuculites oblongatus Grabau and Shimer, 1909, N. Am. Index Fossils, vol. i, 



p. 398, figs. 509a-c. 



Description. — Shell large, elongate ovate, widest at the anterior end; 

 length usually more than twice the height; basal margin nearly straight, 

 sometimes gently arcuate; posterior extremity abruptly rounded; cardinal 

 line slightly oblique, gently arcuate ; anterior end short and rounded and 

 in the inside is a strong vertical clavicular ridge just anterior to the 

 beaks which extends for more than half the height of the shell and in the 

 internal impressions is represented by a strong furrow. Valves depressed- 

 convex in the lower and posterior portions, more convex on the anterior 

 end and in the umbonal region; beaks at about the anterior fourth, ap- 

 pressed, not rising above the hinge-line; umbonal slope broadly rounded 

 and undefined. Test thick in the upper part of the shell ; surface marked 



