602 CRETACEOUS PALEONTOLOGY. 



Remarks. This species is especially characterized by the 

 broad, vertical, posterior truncation of the shell. It also attains 

 a larger size than other species in the New Jersey faunas, al- 

 though Conrad's type specimen, whose dimensions are given, 

 is probably above the average size. 



The shells described by Whitfield as Cyprimeria heilprini and 

 Lucina smockana have the same broad posterior truncation as 

 the type of C. densata; the types have been carefully examined 

 and they do not differ in any essential respect from C. densata 

 and are certainly only smaller individuals of the same species. 



This species should be compared with C. cretacea from the 

 Woodbury clay, but it is proportionally a somewhat higher and 

 shorter species and the posterior truncation of the shell is much 

 broader. 



Formation and locality. Merchantville clay-marl, Lenola 

 (163), Burlington County (Conrad), Crosswicks (Whitfield); 

 Navesink marl, Holmdel. 



Geographic distribution. New Jersey. 



Cyprimeria excavata (Morton). 

 Plate LXVIL, Figs. 1-6. 



1833. Cythere excavata Morton, Am. Jour. Sci., ist ser., vol, 



23, p. 292, pi. 5, fig. i. 



1834. Cythere excavata Morton, Synop. Org. Rem. Cret. Gr. 



U. S, p. 67, pi. 5, %. i. 

 1853. Artemis excavata Con., Proc. Acad. Nat. Sci. PhiL 



( I 853), P- 3 20 - 

 1858. Dosinia densata Con., Jour. Acad. Nat. Sci. Phil., 2nd 



ser., vol. 3, p. 325, pi. 34, fig. 13 (not Tellina densata 



Con,, Jour. Acad. Nat. Sci. Phil., 2nd ser., vol. 2, p. 



275, pi. 24, fig. 14). 

 1861. Dosinia excavata Gabb, Synop. Moll. Cret. Form., p. 



176 (120). 

 1864. Cyprimeria excavata Con., Proc. Acad. Nat. Sci. PhiL 



(1864), p. 212, fig. in text. 



