250 INVERTEBRATA OF MASSACHUSETTS. 



and shining, at the outer base of the tentacula ; mouth rather large, 

 rounded, corrugated ; operculum horny, strong, opake, of few 

 turns. It was sluggish in its movements, and fed eagerly upon 

 fresh beef, especially if somewhat macerated. 



Two imperfect shells in my possession, which I had supposed to be 

 S. Turtbnis, I am now satisfied belong to this species. They are three 

 or four times as large as the shells observed by Mr. Couthouy, and 

 ordinarily found. But by comparison with specimens of S. Turtbnis 

 sent me by Mr. Sowerby, I find the color different, and the brown 

 bands entirely wanting in our shell. In S. Turtbnis 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 dathrus Green- 

 Idndicus of Chemnitz, and hence called Scaldria Grcenlandica, ob- 

 serves, 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 TE'REBRA. 

 i 



SCALA'RIA LINEA'TA. 



Shell conical, white, with eight whorls, traversed by sixteen to 

 eighteen delicate ribs, and the lower one by a revolving, raised line 

 and one or more brownish bands ; aperture oval ; lip strong ; 

 umbilicus none. 



State Coll., No. 50. Soc. Cab. No. 3200. 



Scalaria linekta, SAY ; Journ. Acad. Nat. Sc., ii., 242. Jlmer. Conch., pi. 27. 



Shell elongated-conical, pointed, white or tinged with brown- 

 ish ; whorls eight, rounded, not disjoined, but defined by a well- 

 impressed suture ; about sixteen to eighteen very delicate and 

 slightly raised longitudinal ribs, not crossing the suture, traverse 

 each one ; intervening spaces smooth ; a raised line or rather 

 step, originating from the junction of the lips, revolves on the 

 lower whorl, and defines the upper edge of a reddish-brown re- 

 volving band ; another fainter band is usually seen just below the 

 suture. Aperture sub-oval, bordered by a strong, rounded lip, 



