256 NEW FOSSIL SHELLS 



A. TURBINATUS, PL. 36. FIG. 56. 



A. testa ovato-conicd, crassd, Icevi, sub-perforatd; spird breviusculd, conicd, obtusd; suturis parvis, linewibus; anfractibus 

 quinque, planulatis; anfractu ultimo sub-angulato; basi Icevi; perforatione minima; apcrturd ovatd, sub-ejffusd; plied columellari 

 magnd, acutd. 



Shell ovately conical, thick, smooth, sub-perforate ; spire rather short, conical, obtuse; sutures small, linear; whorls 

 five, flattened; last whorl somewhat angular; base smooth; perforation very small; mouth ovate, sub-effuse; fold on 

 the columella large, acute. 



Length .12. Breadth .08 of an inch. 



Remarks. The fold on the columella is placed about the middle. It can scarcely be 

 seen on a front view; but when the shell is placed obliquely, it appears very large. The 

 mouth is acutely angular above, and rounded and somewhat effuse below. On one 

 specimen I have observed a small impressed transverse line near the upper suture, but 

 my other ones want it. 



This little shell, though without any conspicuous characteristics, does not resemble 

 any of our described species. 



A. ANGULATUS, PL. 36. FlG. 57. 



A. testa subulatd, inferne ovatd, crassd, imperforatd, Icevi; spird attenuatd, cornea, mamillatd; suturis profundis; anfrac- 

 tibus sex, planulatis, prope suturam inferiorem angulatis; anfractu ultimo angulato; basi Icevi; aperturd parvd, subellipticd; 

 plied columellari obtusd, obliqud, 



Shell subulate, ovate below, thick, imperforate, smooth; spire attenuate, conical, mamillate; sutures deep; whorls 

 six, flattened, angulate near the lower suture; last whorl angular ; base smooth; mouth small, sub-elliptical; fold on 

 the columella obtuse, oblique. 



Length .12. Breadth .05 of an inch. 



Remarks. The mouth is nearly elliptical. The angle on the lower part of the 

 whorls is only visible on the inferior ones. Nearer the apex, it becomes obsolete, or is 

 covered by the succeeding whorls. 



. This shell is not unlike the A. melanellus, Lea, but differs from that species in the 

 angular whorls, smaller size, and want of an umbilicus. 



O ' ' 



A. GLANS, PL. 36. FIG. 58. 



A. testa sub-ovatd, tcnui, imperforatd, Icevi, glabrd; spird ovato-conicd, brevi, mamillatd; suturis profundis; anfractibus 

 quatuor, minime convexis, ad suturam superiorem sub-canaliculatis; anfractu ultimo rotundato; basi Icevi; aperturd ovatd, 

 valde effusa; plica columellari parvd, obliqud. 



Shell sub-ovate, thin, imperforate, smooth, glabrous; spire ovately-conical, short, mamillate; sutures deep; whorls 

 four, very slightly convex, sub-canaliculate at the upper suture; last whorl rounded ; base smooth; mouth ovate, very 

 effuse; fold on the columella small, oblique. 



Length .10. Breadth .05 of an inch. 



Remarks. The mouth is very effuse below; so much so, indeed, that it appears to 

 have the rudiments of a canal. It is acutely angular above. The fold on the columella 

 is obtuse, rising abruptly on the upper part and declining gradually on the lower. 



This little shell, from its ovate outline, and the form of its fold, should perhaps be 

 placed in the Tornatella, but the limits of these two genera are so indistinct that it is 

 difficult to decide where the boundary between them exists. I have felt the same doubt 

 with respect to several of the following species, as the A. sculptus, nitens, &c. 



