428 Systematic Paleontology 



very gracefully swollen or convex in the upper part, and prolonged and 

 attenuated below, forming a long, gracefully tapered anterior beak with 

 the columella slightly twisted ; top of the volution rather suddenly con- 

 tracted to the suture; aperture large, very elongate-elliptical in out- 

 line and prolonged below, where it becomes narrowed as the outer lip 

 approaches the axis; columella slightly twisted and marked by from one 

 to three very oblique folds, the middle one of which is usually the 

 strongest; surface of the casts usually smooth, with the exception of (in 

 some cases only) a few distant vertical folds on the upper ones, and on the 

 extreme upper part of the body volution ; but where the external features 

 are preserved, the whole shell is marked by strong, rounded, vertical folds, 

 and but little less strongly marked, rounded, spiral ridges; the spiral 

 ridges moderately distant on the upper part of the volution, but becoming 

 less strongly marked and crowded and finally almost obsolete toward the 

 base."— Whitfield, 1892. 



Volutomorpha conradi, though unmistakably present in the Cretaceous 

 of Maryland, is very rare, and has not been found excepting in the form 

 of casts or very poorly preserved shells. Only a single true columellar 

 fold has ever been noted in any of the individuals properly referable to 

 this species, and it is exceedingly doubtful if Whitfield was correct in his 

 observation that the columella is marked "by from one to three very 

 oblique folds." 



Occurrence. — Monmouth Formation. Brightseat, Prince George's 

 County. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, New Jersey Geological Survey. 



Outside Distribution. — Magothy Formation. Cliffwood clay, New 

 Jersey. Monmouth Formation. Navesink marl, New Jersey. 



VOLUTOMOEPHA PERORNATA n. Sp. 



Plate XVII, Fig. 2 



Description. — Shell small for the group, rather slender, fusiform in 



outline, the maximum diameter falling near the anterior third; spire 



moderately elevated, the whorls closely appressed, flattened, narrowly 



tabulated, increasing uniformly in size within an angle of approximately 



