1899.] NATURAL SCIENCES OF PHILADELPHIA. 77 



than lialf-way up the spiral whorls, the large tubular spine at the 

 shoulder midway between the varices extends outward and slightly 

 forward, aperture ovate. Length 16 mm., greatest diam. 10 mm. 



One adult and three young specimens, from the material col- 

 lected by Thomas A. Morgan, at Jackson, Miss. 

 Morio planotecta (Meyer and Aldrich). Plate I, fig. 12. 



Casnidarla jJlnrwtecta Meyer and Aldr. Jour. Cin. 8oc. Nat. Hist., ix, 

 4:5, pi. 2, fig. 14, 1886. 



A large and handsome specimen of this species was collected by 

 Mr. Thomas A. Morgan at Jackson, Miss. The beautiful drawing 

 by Dr. J. C. McConnell will show all the important adult char- 

 acters not given by Messrs. Meyer and Aldrich, who described the 

 species from a young specimen, from Newton, New^ton Co. , Miss. 

 Length of specimen figured 64 mm., greatest diam. 51 nun. 

 Cassis (Phalium) taitii (Conrad). Plate II, fig. 5. 



Cassis Taitii Coot. Jour. Acad. Nat. Sci., vii, 145, 1834. 



Semicassis Taitii Conr. Amer. Jour. Conch., i, 26, 1865. 



A fragment consisting of the outer lip and portion of the body 

 whorl, 53 mm. in length, was found by the writer, at Jackson, 

 Miss., in the fall of 1894. Since then the specimen figured, which 

 measures 35 mm. in length, was found by Mr. Thomas A. Morgan, 

 at the same locality. The type which is in the Academy of 

 Natural Sciences is from Claiborne, Ala. In the Jackson speci- 

 men the nodulose character of the revolving ridges is only present 

 in the outer half of the body whorl, and obsolete or wanting near 

 the columella. 

 Cypraea jacksonensis n. sp. 



This is the largest species of Cypnm from the Eocene of North 

 America. It is represented only by parts of perhaps three indi- 

 viduals (five specimens). The part of the outer lip measures 68 

 mm. A perfect specimen would probably exceed 90 mm. A 

 specimen representing the dorsal surface has a diameter of 55 

 mm. Shell smooth and polished, lip thick, reflected, teeth large 

 and occasionally bifurcate. 



Collected hj Mr. Thomas A. Morgan and the writer at Jackson, 

 Miss. 

 Cypraea ludoviciana n. sp. Plate II, fig. 6. 



Shell ovate, somewhat flattened, slightly prolonged at the ex- 

 tremities, smooth with a prominent broad medial dorsal groove. 



