A. E. Verrill — MoUusca of the Nevi England Coast. 187 



ceals ; both above and below this, at about equal distances, there is 

 another less prominent carina, the lower one defining the basal area; 

 the upper one is about midway between the median carina and the 

 suture. The intervals between these carinse are bi'oadly concave 

 and crossed by numerous pretty regularly spaced, thin, raised and 

 curved riblets ; those between the upper carina and the suture have 

 their concave side toward the aperture and terminate posteriorly in 

 a small, slightly prominent lobe or crest in crossing the sutural 

 carina; those in the two peripheral zones have their convex side 

 toward the aperture and do not cross the carinse, On the base there 

 are about seven to nine rather prominent revolving cinguli, besides 

 the carina already refei'red to ; the intervals between these are con- 

 cave and variable in width, and are crossed by numerous, small, 

 oblique riblets. The surface of the whorls between the riblets is 

 covered by fine revolving lines, visible with a lens. The umbilicus 

 is represented only by a narrow spiral groove or channel, nearly 

 concealed by the strongly recurved or reflected margin of the colu- 

 mella-lip, and boimded outwardly by a spiral ridge. The aperture 

 is rather large and angulated, or lobed, with a deep, rather broad 

 posterior sinus, which is deepest just above the upper carina, where 

 the corresponding riblets are most strongly excurved ; below this the 

 outer lip is thin, and bends outward and inward, corresponding to 

 the external carinas and their interspaces ; below the periphery and 

 opposite the most convex part of the base the outer lip bends out- 

 ward and shows another shallow sinus ; there is also a small sinus or 

 rudimentary canal at the junction of the lip with the extremity of 

 the columella, which terminates in a small, somewhat prominent 

 angle. The columel la-margin is strongly spirally twisted, much 

 excurved opposite the umbilical region, beyond whicli it curves 

 strongly forward and outward, forming there a small, prominent, 

 sometimes slender tooth, which is often broken. The operculum is 

 ear-shaped or broad-ovate, with an emargination on one side, thii), 

 translucent, pale yellow, with a very delicate, concentric structure. 

 The nucleus is sub-central ; around it are numerous thin, close, con- 

 centric lines, most distinct about midway between the center and 

 margin ; the outer part is transparent and shows no distinct lines ; 

 the muscular attachment is ovate, not very large, and excentric to 

 the center. 



Jaws thin, brown, irregularly ovate, the outer half covered with 

 small tesselated elevations, becoming more prominent, blunt or 

 spatuate at the mai'gin. 



Trans. Conn. Acad., Vol. VI. 24 May 26, 1884, 



