MIOCENE MOLLUSCA AND CRUSTACEA. 129 



TURRITELLA CUMBERLANDIA. 



Plate XXIII, figs. 9-11. 



Turritella Giiinhoiandia Coaiad; Proc. Acad. Nat. Sci. Phila., 18G2, p. 584; Gat. Mioc. 

 Foss.; ibid, p. 567; Meek, Check List Mioceue Foss., p. Ki. 



Mr. Coiu'ad describes this species as follows: "Elongate, tapering grad- 

 ually; volutions twenty-four, bicarinated, carina nearly equal, distant; 

 revolving lines unequal, wrinkled; sides of whorls concave between the 

 carinse, somewhat channelled beneath the lower one and rounded at the 

 base. Length, 2§." 



This species differs from either of the others hei'ein descriljed in hav- 

 ing a, comparatively rounded volution in the larger part of tlie shell and 

 in having the cariuss almost or quite equidistant from the sutures, with the 

 space between them of nearly the same distance as that above or below 

 the carinae. The shell is proportionally slender, and on the upper part the 

 carinas are prominent and the sutures only slightly marked, while on the 

 larger parts the sutures are deeply sunken, which gives a rounded volution. 

 The revolving lines are usually quite obscure and are often obsolete, though 

 sometimes well marked, irregular in size, and numerous. The transverse 

 lines, when well marked, are seen to form a strong retral sinus in crossing 

 the middle of the volutions. Aperture round. The shells are always 

 imperfect in collections, but when a larger and a smaller one are fitted' 

 together, as in the long- specimen figured, a specimen measuring- two inches 

 and an eighth in length possesses twenty-one volutions. 



Locality: All the examples which I have seen appear to have come 

 from Shiloh, N. J. Mr. Conrad's examples were from the same place. 

 Collections at Rutgers College and the National Museum. 



Turritella secta. 



Plate XXIII, figs. 15-17. 



Turritella secta Conrad: Proc. Acad. Nat. Sci. Phila., vol. 7, 1855, p. 208; Cat. 

 Miocene Foss. Atlantic Slope, Proc. Acad. Nat. Sci., 18G2, p. 508; Meek, Check 

 List Miocene Foss., p. 10. 



Mr. Conrad describes this species as follows: "Turreted; volutions flat- 

 tened or plano-convex at the sides, with minute obsolete revolving lines, a 



MON XXIV 9 



