506 Systematic Paleontology 



Margarita abyssina Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 



133, pi. xvii, figs. 1-5. 

 Margarita abyssina Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 20. 

 Margarita abyssina Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 669, pi. lxxv, figs. 20-22. 



Description. — " Shell conical ; whorls three, rounded ; mouth circular, 

 surface markings unknown. A cast."- — Gabb, 1861. 



Type Locality. — Burlington County, New Jersey. 



" Shell small, not exceeding half an inch in its greatest diameter: spire 

 moderately elevated, the apical angle being about 70° or 75° ; volutions four 

 to four and a half, very ventricose, giving a circular section when broken 

 across ; suture deep and well marked, while the whorls in the internal cast 

 are closely appressed and slightly imbedded into each other, showing 

 the shell to be thin ; also seen where the cast rests partially in the matrix, 

 the space left by the removal of the shell where no compression has 

 occurred being barely perceptible ; umbilicus broad and open, showing 

 several of the volutions within; surface marked by very fine, even, spiral 

 lines over the entire shell, with an apparent stronger line on the periphery, 

 and crossed by finer lines of growth, which are bent backward in crossing 

 the volution, cancellating the surface." — Whitfield, 1892. 



Margarites abyssina (Gabb) is intermediate in size and number of 

 whorls and relative altitude of spire between M. elevata and 21. depressa. 

 It is, however, much closer to the former than to the latter. 



Occurrence. — Matawan Formation'. ITlmstead Point, Magothy 

 Eiver, Anne Arundel County. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, New Jersey Geological Survey. 



Outside Distribution. — Matawan Formation. Merchantville clay marl, 

 Woodbury clay, New Jersey. Monmouth Formation. Navesink marl, 

 Tinton beds, New Jersey. 



Margarites elevata n. sp. 



Plate XIII, Pig. 5 



Description. — Shell of moderate- size for the genus; whorls five in 

 number, increasing regularly in size, flattened posteriorly in the casts, 



