314 Mo)iograph of the Gasteropoda. 



Genus Carinaropsis — (Hall, 1847). 



[From lis resemblance to Carinaria.'] 



Symmetrical, subconical, patelliform, siibangulated or carinated on 

 the dorsal line ; apex incurved or convolute ; aperture oval, narrowed 

 posteriorly. 



Carinaropsis patelliformis — (Hall, 1847). 



Obliquely subconical, patelliform, the apex incurved and extended 

 in a line with or beyond the margin, obtusely carmated upon the dor. 

 sal line ; aperture broadly oval, slightly narrowed posteriorly ; surface 

 marked by fine concentric sublamelliform striae. 



The fossils referred to this species are quite rare ; one, which I have, 

 I found at the quarries back of Cincinnati ; Dr. R. M. Byrnes has one 

 that he found about the city, but does not recollect where, and Mr. 

 James has the best one I have seen, which he found several years ago, 

 but does not remember the locality. Its range is therefore unknown. 



Genus Murchisonia — (D'Aechiac). 



Shell elongated, many whorled ; whorls variously sculptured, and 

 zoned like Pleurotomaria ; apertui-e slightly channeled in front; outer 

 lip deeply notched. The appearance is somewhat like an elongated 

 Pleurotomaria. 



31urchisonia heUicincta — (Hall, 1847). 



Elongated; spire composed of eight or more volutions, which are 

 regularly convex, and somewhat rapidly enlarging from the apex; vo- 

 lutions moderately o])lique, marked upon the center by a flat spiral 

 band, which is margined by slight sharp elevations ; striae bending 

 backward from the suture to the mesial band, upon which they make 

 an abrupt curve forward ; aperture rounded, extending below, with 

 the columellar lip nearly straight. 



This is a large and beautiful species, known by its moderately 

 ascending spire and regularly ventricose whorls, which render it read- 

 ily distinguishable in its usual condition, as casts of the interior. The 

 mesial band divides tlie volution almost equally, producing no appre- 

 ciable elevation except at the sharp marginal carina ; and where these 

 are worn down, as they sometimes are, the volutions preserve their 

 equal convexity. 



