466 Systematic Paleontology 



This species resembles M. cancellaria Con., but can be distinguished by its 

 more elevated spire and its more robust form." — Gabb, 1860. 



Type Locality. — New Jersey. 



" Shell of medium size, subgiobular or subpyriform, with three or four 

 ventricose volutions, which are most inflated on the upper third. The 

 dimensions of a nearly complete internal cast are : Height 19 mm., maxi- 

 mum diameter 16 mm., height of aperture 17 mm., width of aperture 8 mm. 

 Spire rather low; aperture broadly elliptical, pointed above and obtusely 

 so at the base; columellar cavity of medium size, with a single strong 

 spiral ridge near the anterior margin. Surface of the shell marked by 

 eight to eleven strong spiral ridges, leaving a plain space at the base of the 

 shell equal in width to that of two of the ridges; surface marked also by 

 somewhat more distant, transverse, broadly rounded ridges, which are 

 nodose at the points of junction with the revolving ridges." — Weller, 1907. 



The form tentatively referred to this species presents a relatively 

 stronger spiral sculpture than the type. The specimen in question is a 

 well preserved cast of the external surface. The spire is reticulately orna- 

 mented and its surface marked off into a series of squarish pits approxi- 

 mately uniform in size and arrangement. On the body the wide, flattened 

 spirals dominate the narrower and much less prominent axials which, 

 though they partially dissect the spiral fillets, are little more than vigorous 

 incrementals. 



Occurrence. — Matawan Formation'. Chesapeake and Delaware Canal 

 (exact locality not known) . 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences. 



Outside Distribution. — Matawan Formation. Merchantville clay, New 

 Jersey. 



MOREA MARYLANDICA n. Sp. 



Plate XVIII, Fig. 13 

 Description. — Shell rather small for the genus, ovate-elliptical in out- 

 line; aperture probably about two-thirds of the total altitude ; spire very 

 imperfect, but probably composed of only a few flattened whorls minutely 



