10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 72 



the periproct is a little smaller and is situated in a shallower, nar- 

 rower sulcus, and the apical system is markedly smaller. However, 

 it is very closely related and might appropriately be regarded as a 

 varietal form. Clark's specimen, according to the record, was found 

 by W J McGee near Holly Springs, Miss., but this is obviously an 

 error, as this town is located on the outcrop of nonmarine Wilcox 

 Eocene strata, at least 25 miles west of the nearest surface occurrence 

 of the marine Ripley formation. 



Locality. — From the new Rocky Point quarries, a mile northeast 

 of Rocky Point station, Pender County, N. C. Collected by L. B. 

 Kellum in 1923 and by L. W. Stephenson in 1926. 



Geologic 'position. — Upper Cretaceous, upper part of Peedee forma- 

 tion, upper part of Exogyra costata zone. European equivalent, 

 upper Senonian (Maestrichtian). 



Type material. — The material from the new Rocky Point quarries 

 in the National Museum collections includes seven specimens, none of 

 which is perfectly preserved. The specimen shown in Plate 3, Fig- 

 ures 3-5, is named the type (Cat. No. 73423), but this specimen needs 

 to be supplemented by some of the other material (Cat. No. 73424). 

 There is also one specimen of this species in the National Museum 

 collections (Cat. No. 28930) from the Cretaceous in a well at the 

 waterworks at Wilmington, which is incorrectly labeled Gassidulus 

 aequoreus Morton. The depth at which the specimen was taken is 

 not indicated on the label, but the upper part of the Peedee forma- 

 tion crops out in the bank of Northeast Cape Fear River, a short 

 distance below the waterworks where the well is located, and the 

 specimen probably came from a very shallow depth. 



LINTHIA VARIABILIS Slocnm 

 Plate 5, figs. 1-7 



1909. Linthia variabilis Sloctjm, Field Mus. Nat. Hist. Pub. 134, Geol. ser. 



vol. 4, No. 1, pp. 12-14, pi. 3, figs. 1-11. 

 1915. Linthia variaMUs Claek, U. S. Geol. Survey Mon. 54, pp. 99-100, pi. 54, 



figs. la-l. 



Among the collections of the Geological Survey is a tray contain- 

 ing six echinoids from near Wilmington, N. C, identified and 

 labeled by Dr. W. B. Clark as Eerrdaster ungula (Morton). After 

 the matrix which concealed most of the surface characters had been 

 removed it was found that these specimens did not belong to the 

 genus Hemiaster but to the genus Linthia, as shown by the presence 

 of both peripetalous and lateral fascioles. A comparison of these 

 specimens with the types of Linthia variabilis Slocum and with 

 specimens of that species in the Geological Survey collections from 

 the vicinity of Pontotoc, Miss., shows that they are very close to and 

 are probably identical with Slocum's species. About the only dif- 



