386 MURICID^. 



oblique, delicate folds above the commencement of the canal. 

 Length, seven tenths of an inch ; breadth, three tenths of an incli ; 

 divergence, forty-five degrees. 



Mingan, in the Gulf of St. Lawrence, taken from the stomachs 

 of codfish, by Mr. Foster, fisherman, in summer of 1841. 



This remarkable and truly beautiful shell is not very nearly al- 

 lied to any species with which we are acquainted, unless it be to that 

 of F. fusiformis, Valenciennes, from New Holland. That species, 

 however, is much larger than our shell, is much less regularly and 

 strongly ribbed, and has a tooth-like process on the laliium, of which 

 our shell is destitute. We suppose this to be the first and only spe- 

 cies of the genus that has ever been found on our coast. (^Mighels 

 and Adams.} 



Halifax (mv/w). 



Oenus RA1VELI.A, Lamarck. 1812. 



Shell oblong-oval, thick, nodulous, having a line of varices on 

 each side, formed at each half revolution ; aperture oval, terminat- 

 ing in a straight canal in front, and in a notch posteriorly ; lip 

 thickened. 



Ranella caudata. 



Fig. 204. 



Shell rhomboidal, thick, cinereous brown, checkered with longitudinal ribs and 

 revolving lines, canal long and straight. 



Ranella caudata, Sat, Journ. Acad. Nat. So. ii. 236 (1822); Amer. Conch, pi. 48.— 

 Gould, Tnv. Isted. 297, fig. 204. — Adams, Best. Journ. Nat. Hist. ii. 269. — De 

 Kay, N. Y. Moll. 1.39, pi. 8, fig. 176, — Stimpson, Check Lists, 6. 



Shell rhomboidal, solid, of a dark, mahogany color, obscured by 



a substance like bluish mould ; there are five angular whorls, 



^A,^* traversed lengthwise by eleven elevated ribs, of which one 



at the left side of the largest whorl, and the one bordering 



the aperture, are enlarged into strong, wing-like varices ; 



these are crossed by equidistant, revolving threads, which 



together form a network over the shell ; aperture inversely 



ovate, rounded behind, and pointed before ; outer lip thick, 



margined within by thick granules which alternate with tlie 



external lines; pillar lip curved, flattened, and smooth, and, with 



the throat, is bluish-white ; canal about the length of the spire, 



