ciECUivi. 315 



1)0 S. Tarfonis, I am now satisfied belong to this species. They 

 arc three or four times as large as the shells observed by Mr. Cou- 

 thouy, and ordinarily found. But by comparison with specimens of 

 S. Turtoms sent me by Mr. S(.)werby I find the color different, and the 

 brown bands entirely wantino: in our shell. In S. Turtonis the whorls 

 are more numerous, and more convex ; the ribs are more delicate, 

 and the intervening revolving lines are more numerous and far more 

 delicate. Moreover, Mr. Sowerby, in indicating it to be the Turbo 

 clnthrus GroRnIandicus of Chemnitz, and hence called Scalaria Grcsn- 

 landica, observes, that it sometimes attains the length of two inches 

 and a half. On account of the flatness of the whorls, and the suture 

 being partially filled by the ribs, this shell has the outline of a Terebra. 



Family TURRITELLID^E, Clark. 

 Shell spiral, many-whorled, or tubular ; aperture simple in front. 



Oentis CECUilI, Flemixg. 1824. 



Shell when young discoidal, when adult decollated, tubular, 

 cylindrical, arcuated ; aperture round, entire ; apex closed by a 

 mammillated septure, marking the point at which the original spire 

 has been cast off. 



Csecum pulchellum. 



CcBcum pnlcMhm, Stimpson, Proc. Bost. Soc. iv. 112 (1851) ; Shells of New England, 

 36, pi. 2, fig. 3 ; Check Lists, 5. 



Shell in its adult state clavate, one tenth of an inch in length and 

 twenty-five thousandths of an inch in breadth at its broadest part, 

 arcuated, contracted at both extremities, and having a somewhat 

 angular appearance at its outer or dorsal outline, which is much 

 longer than the inner. It is somewhat thick and strong, of a pale 

 yellowish-brown color, and sculptured with about twenty-five strong 

 rounded ribs, broader anteriorly, but narrower posteriorly, than 

 their interspaces, not projecting sharply beyond the outline of the 

 shell, but giving it a waved appearance. Operculum multi-spiral, 

 of about eight volutions, corneous and concave on the outer surface. 



The animal agrees nearly with the English species, C. trachea^ 

 as described by ]Mr. Clark. The head projects but little in advance 

 of the foot, which is short. The muzzle is cleft and transversely 

 wrinkled, and has two black spots above just in front of the tentac- 



