MOLLUSCA. 723 



1861. Cyprcea Mortoni Gabb, Synop. Moll. Cret. Form., p. 104 



(48). 

 1864. Cyprcsa Mortoni Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 19. 



1868. Cypreea Mortoni Con., Cook's Geol. N. J., p. 729. 

 1892. Cypraa (Aricia) Mortoni Whitf., Pal. N. J., vol. 2 



(Monog. U. S. G. S., vol. 18), p. 120, pi. 15, figs. 1-3. 

 1905. Cyprcsa mortoni Johns., Proc. Acad. Nat. Sci. Phil. 

 P- 2 3- 



Description. "Ovate; (casts) spire enveloped; mouth finely 

 crenate on both sides; shell widest about the middle; no mark- 

 ings on the cast." (Gabb.) 



Remarks. Only two specimens of this species from New Jer- 

 sey have been observed, one of them being the specimen used by 

 Gabb as the type of the species. This type specimen is so im- 

 perfect that only the generic characters of the shell are certainly 

 retained. It gives evidence, however, that it is an adult indi- 

 vidual, so that about the only character of any specific value at all 

 is its small size. The specimen is 17 mm. long and 13 mm. wide; 

 it is broadly ovate in outline; the spire is flat and the cast is 

 most ventricose about one-third of its length from that end, with 

 a slight indication of angularity at the point of greatest diameter 

 on the outer half of the last volution. The outer lip shows the 

 infolding to> a slight extent, but there are no indications of the 

 fine crenulations of the lip nor of the opposite side of the aper- 

 ture mentioned in the original description. This character was 

 probably seen only upon the southern specimen, which was also 

 included among the types of the species. The exterior of the 

 cast is entirely smooth. The second specimen is also an internal 

 cast. It differs from the type in being a little more slender, its 

 dimensions being: length 21 mm., and width, 12.3 mm. Its con- 

 dition of preservation is similar as to that of the type and little 

 more than its generic characters can be detected. 



Formation and locality. Navesink marl, Atlantic Highlands 

 (108), Burlington County (Gabb). 



Geographic distribution. New Jersey, Alabama. 



