676 CRETACEOUS PALEONTOLOGY. 



specimens, but on one specimen they seem to consist of closely- 

 arranged spiral lines. The generic relations of the species have 

 not been satisfactorily determined. 



Formation and locality. ? Cliffwood clay, Cliffwood Point 

 (Whitfield). 



Geographic distribution. New Jersey.' 



Genus CAVOSCAI^A Whitfield. 



Cavoscala annulata (Morton). 

 Plate LXXVL, Figs. 5-7. 



1834. Scalaria annulata Mort., Synop. Org. Retru Cret. Gr. U. 



S., p. 47, PL 3, % 10. 

 1 86 1. Scala annulata Gabb, Synop. Moll. Cret. Form., p. 135 



(79). 

 1864. Scala annulata Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 20. 



1868. Scala annulata Con., Cook's Geol. N. J., p. 729. 

 1876. Scala (O polio) annulata Gabb, Proc. Acad. Nat. Sci. 



Phil. (1876), p. 298. 

 1892. Cavoscala annulata Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 1 8), p. 177, pi. 22, figs. 1-5. 

 1905. Scala annulata Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 20. 



Description. "Shell above a medium size for shells of this 

 group, the largest individual, if perfect at the apex, would meas- 

 ure fully i j^j inches in length, with the aperture probably yet im- 

 perfect. Volutions about seven in number in the largest speci- 

 men, v*ery ventricose and very slightly angular in the middle, 

 closely coiled or in close contact ; sutures deeply marked and 

 characterized by a slightly beaded band at the bottom, formed 

 by the edge of a broad, flattened, raised, or thickened space, which 

 marks the base of the volutions and borders the umbilicus. 

 Umbilicus very large, angular on the margin and rapidly slop- 

 ing within, showing the preceding volutions in the cavity. Aper- 



