EASTERN PROVINCE — iNTl'RIOR REGION SPECIES. 27.') 



its upper margiu subsiinple, its basal margin much dilated iuwardly, 

 with a slight median cleft ; far withiu, on the base of the shell, is a 

 stout, transverse tubercle. Greater diameter 9, lesser S""" ; height, 



Kmva 



CaracoUa Edgariana,'LTL\, Trans. Am. I''hil.Soc.,ix,2; Obs., iv, 9 (1843) ; Proc, ii, 31 



(1841) ; iu Troschel's Arch. f. Nat., 1843, ii, 124. 

 Relix Edgariana, Pfeiffer, Mon. Hel. Viv., i, 425. — Binney, Terr. Moll., ii, 155, pi. 



xliv, fig> 2.— Reeve, Con. Icou., 703.— W. G. Binney, Terr. Moll., iv, 65 ; 



L. & Fr.-W. Sh., i, 114 (1869).— Bland, Aun. N. Y. Lye, vii, 428, pi. iv, 



fig. 18. 

 Stenotrema Edgariana, Tryon, Am. Journ. Concli., iii, 59 (1867). — W. G. Binney, 



Terr. Moll., v, 293. 



Distribution like S. lahrosum. 



S. Edgarianum differs from spinosum in the following particulars : It 

 is smaller, more elevated, and more convex beneath. In form the pa- 

 rietal tooth is most like that of stenotremum, while that of spinosum is 

 more nearly allied to that usually prevailing in Mrsiitwn. The whorls 

 of spinosiim are flattened and exserted, the carinated edges of all being 

 seen, but in Edgarianum the upper whorls are rather convex, and de- 

 fined 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 specimens have, no doubt, the cilia, as in spinosum. 



Animal not observed. 



Stenotrema £dvardsi, Bland. 



Shell imperforate, lenticular, carinate, the carina obsolete near the 

 aperture, rather thin, beneath the epidermis i)ale brown; the j,^^ ^^^ 

 epidermis dark chestnut-color, with numerous, minute, curved, 

 hair like processes lying flat upon and attaclied to the epi- 

 dermidal surface of the upper whorls in the direction of the 

 incremental striae, the epidermis at the base covered with ^s. Edvcu-dsi. 

 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 spiral lines beneath the epidermis; 

 suture deeply impressed ; aperture oblique, transverse, auriform, nar- 

 rowed by a slender, slightly arcuate, lamelliform parietal tooth extend- 

 ing across from the umbilical axis, and terminating with a short, angular 



