ADMETE. 391 



umbilicus, which is also bounded externally by a revolving ridge ; 

 llie two lips meet in front at an acute angle, forming a short, slightly 

 excavated canal, turning a little to the right. Length, seven tenths 

 of an inch ; breadth, four tenths of an inch ; divergence, forty-eight 

 degrees. 



Found in considerable numbers, though rarely entire, in fishes 

 taken in Massachusetts Bay. St. Anne (^Bcll) ; Eastport, twenty 

 fathoms (^Cooper) ; Halifax (^Willis) ; fossil, Montreal {Dawson). 



Mr. Couthouy makes the principal points of difference Ijetween 

 his shell and the burealis of Sowerby to be, a greater number of 

 keels on the lower whorl, the less breadth of that whorl, and the 

 shorter fringe upon it. But these detailed portions are by no means 

 constant. I have sent specimens to Mr. Sowerby. who assures me 

 they are the same as his burealis received from Melville's Island, 

 many years ago. He also sent another imperfect shell, dredged at 

 Oban, in Argyleshire, by Mr. Jeffreys, and named by hini T. acii- 

 minatiis, which I cannot perceive to differ at all from our shell. 

 This is probably its southern limit. 



Oeiius AD.IIETE, Miller. 1842. 



Shell ovate, turreted, cancellated ; canal partial, very short or 

 wanting ; pillar plaited, the folds nearly transverse. 



Admete viridula. 



Fig. 190. 



Shell ovate-conic, white, reticulated with coarse revolving lines, and lines of 

 growth; three folds upon the pillar. 



Tritonium vir'tdulum, O. Fabricius, Fauna Gra?nl. 



Cancellaria buccinoiiks, CouTiiocY, Bost. Journ. Nat. Hist. ii. 105, pi. 3, G^. 3. 



Cancdlaria Coiithoiii/i , Jay, Catal. of his Cabinet, 1839. — Gould, Inv. 1st ed. 283. — 



De Kay, N. Y. Moll. 188, pi. 7, fig. 160. 

 Admete viridula, Stimpson, Check Lists, 6. 



Shell ovate-conical, somewhat turreted, milky-T\-hite, approaching 

 to horn color ; whorls five or six, convex, flattened at the 

 top ; suture well-defined, and sometimes profound ; apex 

 acute, the anterior whorl composing two thirds the length 

 of the shell ; surface marked with distinct lines of growth, 

 and sometimes rising into folds near the suture ; coarse re- 

 volving lines surround it, which, with the folds form a net- 

 work ; aperture half the length of the shell, oval ; outer lip sharp, 



