395 CRETACEOUS PALEONTOLOGY. 



be made. They are certainly quite distinct from the true C. vul- 

 garis. 



A somewhat common Cttcullaea in the Red Bank sand has been 

 questionably identified as this species, but it usually grows larger 

 than the Marshalltown examples, and judging from the impres- 

 sions of the exterior the fine radiating costae upon the surface 

 of the shell are more strongly developed and the cardinal areas 

 higher with the beaks consequently more widely separated. In 

 one well preserved impression of the cardinal area from this 

 formation, nine of the diverging furrows may be clearly recog- 

 nized beneath the beak, while in the Swedesboro specimens only 

 four or five are usually present, and seven is the maximum num- 

 ber which has been observed. Whitfield has identified one of the 

 specimens from the Tinton beds at Beers Hill cut south of Key- 

 port, as C. tippana. This locality has furnished a large number 

 of specimens in the recent collections, and although they are for 

 the most part poorly preserved, they present no characters by 

 which they can be separated from the specimens from the Red 

 Bank sand. 



Formaiion and locality. — Marshalltown clay-marl, near 

 Swedesboro (177, 179), Marshalltown (190); Wenonah sand,, 

 near Marlboro (130) ; Navesink marl, Atlantic Highlands (108), 

 near Jacobstown (150); Red Bank sand, Shrewsbury River 

 (116, 119); Tinton beds. Beers Hill cut, south of Keyport: 

 (129'', 129^), near Freehold (132). 



Geographic distribution. — New Jersey, Mississippi. 



Cucullaea neglecta Gabb. 

 Plate XXXL, Figs. 1-4. 



1861. CiicullcEa neglecta Gabb, Proc. Acad. Nat. Sci. Phil.,, 



1861, p. 326. 

 1876. Idonearca neglecta Gabb, Proc. Acad. Nat. Sci. Phil.,, 



1876, p. 314. 



Description. — Shell oblique, subrhomboidal in outline, the di- 

 mensions of a nearly perfect internal cast being : length, 39 mm. ; 

 height, 28.5 mm., thickness, 22 mm. Beaks of the internal cast 



