c^cuM. 315 



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

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

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

 S. Tiirionis sent mc by Mr. Sowerby I find the color different, and the 

 l)ro\rn bands entirely wanting in our shell. In S. Turtonis the whorls 

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

 and tlie intervening revolving lines are more numerous and far more 

 delicate. Moreover, ]\Ir. Sowerby, in indicating it to be the Turbo 

 c/afJinis Gra'iilandicus of Chemnitz, and hence called Scalaria Grrpn- 

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

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

 being partially filled by the riljs, this shell has the outline of a Tercbra. 



Family TURRITELLID^E, Clark. 

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



Ociius C.ECUI^I, Flf.mixo. 1824. 

 Shell when young discoidal, when adult decollated, tubular, 

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

 mannnillated septure, marking the point at which the original spire 

 has been cast off. 



Csecum pulchellum. 



Ccmum pnkhdliim, Stimpson, rroc. 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 mucli 

 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 nmlti-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- 



