FAMILY TURBLNIOE — ANCULOTUS. 101 



M. catenoides. (Id. lb. pi. 6, fig. 60.) Shell granulate, elevated, conoidal ; apex folded ; sutures 

 small ; aperture ovate ; no tubercles nor carina. Color : adult black ; young green or yellow. 

 Length, 0' 93; diameter, - 43. Georgia. 



M. vestita. (Conrad, Fr. Wat. Sh. p. 57, pi. 8, fig. 12.) Shell subulate, subturreted : whorls 

 nine, each angulated below the middle ; suture deeply impressed ; whorls near the apex 

 acutely carinated. Color: epidermis smooth, polished, horn-colored, with a dark band re- 

 volving below the angle of each whorl. 



GENUS ANCULOTUS. Say. 



Shell suboval, rarely conical. Spire generally depressed. Aperture suborbicular or obovate, 

 rounded at the base. Base of the columella rounded, or obtusely angulated. Columella 

 wide, thickened, polished, generally with a callus near its superior junction with the 

 labrum. 



Obs. This genus was first separated by Say from Melania, under the name of Anculosa 

 (Ac. Sc. 2, 178), which was subsequently changed to Anculotus. It includes those which 

 have a shorter spire, and the outer lip more rounded anteriorly. I am not aware that the 

 animals of this genus have been examined. 



Anculotus carinatus. 



(state collection.) 



Description. Shell short, pyramidal, thin, fragile. Whorls with a distinct elevated carina, 

 rather suddenly attenuated to the apex, which is frequently eroded : the whorls are polished, 

 with incremental striae ascending to the edge of the carina, where they become multiplied, 

 especially on its lower aspect. Suture canaliculate, by the elevated carina ; aperture sub- 

 rhomboidal ; outer lip simple, angular, reflected at the base ; pillar-lip concave, with a broad 

 callus ; outer lip above contiguous to the carina of the preceding whorl. 



Color. Amber, darker towards the lip. 



Length, 0'45; of aperture, 0'25. Extreme width, 0'4. 



This very remarkable species, which may probably form the type of a new genus, is from 

 Lake Champlain. My thanks are due to Dr. B. W. Budd, for an opportunity of adding this 

 to the State Collection. I have since obtained others from Cranesport, Broome county, in 

 one of the tributaries of the Susquehannah. These are dark olive-green, and many of them 

 0'5 - 0'6 long. An eminent conchologist pronounces it identical with A. dissimilis, but I 

 have not found the description of this species. 



