STEXOTREMA. 293 



Stenotrema Edgarianum, LEA. 



Shell imperforate, lenticular, carinated, solid, arcuately striate, under the 

 epidermis yellowish flesh-color, with distant, short, prostrate hairs ; spire con- 

 vex-conoid, rather obtuse; whorls 5, flattened, the last ante- 

 riorly deflected, subconstricted ; aperture very oblique, most 

 narrowly ear-shaped, narrowed by a stout, tongue-shaped, 

 arcuately entering tooth on the full length of the parietal wall ; 

 peristome subcontinuous, its upper margin subsimple, its 

 basal margin much dilated inwardly, with a slight median cleft ; 

 far within on the base of the shell is a stout, transverse tuber- 

 cle. Greater diameter 9, lesser 8 mill. ; height, 5 mill. 



Caracolla Edgariana, LEA, Trans. Am. Phil. Soc., IX. 2 ; Obs., IV. 2 (1843) ; 



Proc., II. 31 (1841) ; in TROSCHEL'S Arch. f. Nat., 1843, II. 124. 

 Helix Edgariana, PFEIFFER, Mon. Hel. Viv., I. 425. BINNEY, Terr. Moll., II. 



155, PI. XLIV. Fig. 2. RERVE, Con. Icon., 703. W. G. BIXNEY, Terr. 



Moll., IV. 65 ; L. & Fr.-W., Sh., I. 114 (1869). BLAND, Ann. N. Y. Lye., 



VII. 428, PI. IV. Fig. 18. 

 Stenotrema Edgariana, TRYON, Am. Journ. Conch., III. 59 (1867). 



Distribution like S. labrosum. 



S. Edgarianum differs from spinosum in the following particulars : it is smaller, 

 more elevated, and more convex beneath. In form the parietal tooth is most 

 like that of stenotremum, while that of spinosum is more nearly allied to that 

 usually prevailing in hirsufum. The whorls of spinosum are flattened and ex- 

 sertcd, the carinated edges of all being seen, but in Edgarianum the tipper whorls 

 are rather convex, and defined by a well-marked suture. Traces of hairs rarely 

 exist at the base of spinosum, and no scars indicating their presence are visible 

 on dead or denuded shells, whereas in Edgarianum there are distant, short, 

 prostrate hairs, with strongly marked scars on the shell. Fresh or young speci- 

 mens have, no doubt, the cilia, as in spinosum, 



Animal not observed. 



Stenotrema Edvardsi, BLAND. 



Shell imperforate, lenticular, carinate, the cai'ina obsolete near the aperture, 

 rather thin, beneath the epidermis pale brown ; the epidermis dark chestnut- 

 color, with numerous minute curved hair-like processes lying flat 

 upon, and attached to, the epidcrmidal surface of the upper whorls 

 in the direction of the incremental stria?, the epidermis at the 1m-'' 

 covered with acute, raised, transverse tubercles, most numerous, 

 and having erect bristles near the aperture ; spire convex-conoid ; 

 whorls 5, flattened, gradually increasing, the last gibbous above, 

 suddenly but slightly deflected; apex minutely granulate; base 

 convex, little indented in the umbilical region, and with impressed 



