296 



PALEONTOLOGY OF NEW-YORK. 



Rome, Oneida county. I have collected the same species from Cincinnati ( Ohio ) , and 

 Madison (Indiana). In the latter it place it is associated with Favistella stellata and 

 Avihonychia radiata. (State Collection.) 



203. 4. MODIOLOPSIS NASUTUS. 



Pl. LXXXI. Fig. 2. 



Cypricardites nastita. Conrad, Ann. Geol. Report, 1841. 



— modiolaris. Emmons, Geol. Report, 1842, pag. 403, fig. 4. 



Reference pag. 1.59, pi. 35, fig. 7, of this volume. 



Narrow, subellipticaL; base straight; cardinal line nearly direct; anterior extremity 

 produced into a narrow extended nasute form ; posterior extremity obliquely truncated, or 

 more or less rounded ; surface scarcely marked by concentric lines of growth. 



This shell is distinguished from the preceding species, in being uniformly narrower ; all 

 that part behind the beak is of nearly equal width, and the beak more central, being 

 distant from the anterior extremity one third the length of the shell. The muscular 

 impression is scarcely distinct in any specimen which I have examined. The characters 

 represented in the figure are constant in several specimens examined, and there appears 

 to be no varieties intermediate between this one and the M. modiolaris, which is a far 

 more abundant fossil. 



Position and locality. This species occurs in the arenaceous strata of the higher part of 

 the Hudson-river group, and I have never seen it in the softer shales. The principal 

 localities are near Rome, Oneida county, and Loraine, Jefferson county. {State Collection.) 



352. 12. MODIOLOPSIS TRUNCATUS (»i. *;).). 



Pl. LXXXI. Figs. 3 a, b. 

 Compare Cypricardia Deshayesiana, de Verneuil, Pal. Russia and the Ural Mountains, pag. 304, pl. 20, fig. 1. 



Oblique, transverse, sub-trapezoidal ; the cardinal and basal margins diverging from the 

 anterior extremity, convex ; beaks near the anterior extremity, with an obscure elevated 

 ridge extending obliquely to the base ; posterior extremity obliquely truncate ; muscular 

 impression very distinct, a little in advance of the beaks, and at the anterior extremity, in 

 the cast projecting beyond the margin ( see figure ) . 



This shell differs but little from some of the varieties of M. modiolaris ; but it is pro- 

 portionally broader, and the beaks are closer to the anterior extremity, while the muscular 

 impression seems to be placed upon the very margin of the shell. It is mucli less common 

 than the M. m.odiolaris, and the few specimens examined appear to be constant in tlie 

 characters given. It bears a close resemblance to the figure of de Verneuil cited above, 

 but it is less ventricose, our specimen being crushed and destitute of the shell. 



Fig. 3 a. View of the right valve of this species. 



Fig. 3 4. Profile view, one valve being more compressed than the other. 



Position and locality. This species occur-s near Rome, Oneida county, and at Cincinnati 

 (Ohio). 



