258 NEW FOSSIL SHELLS 



smaller and closer. The mouth is not effuse, acutely angular above and rounded below. 

 The fold on the columella is unusually large, and is very wide at base. 



The only species of Acteon, with which this little shell could be confounded, is the A. 

 melanoides, Conrad, but its smaller size, more ovate shape, and greater number of striae 

 on the body whorl, sufficiently distinguish it from that species. 



A. SIMPLEX, PL. 36. FIG. 62. 



A. testa elevato-conicd, acuminatd, crassd, Icevi, perforatd; spird attenuatd, mamillatu; suturis excavatis, profundis; 

 anfractibus sex, planis, ad suturam inferiorem angulatis; anfractu ultimo angulato; basi Icevi; perforalione parvd; 

 aperturd quadratd, effusa; plica columellari lamellari, acutd. 



Shell elevately conical, acuminate, thick, smooth, perforate; spire attenuate, mamillate; sutures excavated, deep; 

 whorls six, flat, angulated at the lower suture; last whorl angular; base smooth; perforation small; mouth quadrate, 

 effuse; fold on the columella lamellar, acute. 



Length .12. Breadth .05 of an inch. 



Remarks. The mamelon of the apex is large and very irregular in its shape. The 

 angle on the whorls is very near the lower suture, which gives them somewhat the ap- 

 pearance of being canaliculate. The fold on the columella is acute and very thin. The 

 mouth is angular above and below. 



This shell bears a general resemblance to some of the smooth Acteons from Claiborne, 

 without being sufficiently allied to enable me to class it with any of them. It also 

 closely approaches the A. angulatus, herein described, but the umbilicus of this species 

 readily distinguishes it, 



GENUS PYRAMIDELLA. 

 P. stiTURALis, PL. 36. FIG. 63. 



P. testa turritd, elevatd, crassd, Icevi, nitente, perforatd, sulcata; spird conicd, attenuatd; suturis linearibus; an- 

 fractibus octo, planis; anfractu ultimo angulato, medio sulcato; sulco uno, parvo, transverse; basi carinatd; perfora- 

 tions minima; aperturd quadratd, valdd effusa; columella triplicatd, plied und maxima acutd, duobus parvis; labro 

 dentibus magnis internis, out duobus aul tribus. 



Shell turrited, elevated, thick, smooth, shining, perforated, sulcate; spire conical, attenuate; sutures linear; whorls 

 eight, flat; last whorl angular, sulcate in the middle; sulcus transverse, small; base carinate; perforation very small; 

 mouth quadrate, very effuse; columella with three folds, one very large and acute, the others small; outer lip with 

 two or three large teeth internally. 



Length .20. Breadth .08 of an inch. 



Remarks. The sulcation on the last whorl is seen at the upper part of those of the 

 spire, forming an apparently double suture. This sulcation is triangular, with one side 

 perpendicular and the other very sloping. Immediately above it is a little raised ridge, 

 or small carina. The sulcation is placed directly on the angle of the last whorl. Of the 

 folds on the columella, the upper one is large and horizontal, situated immediately at its 

 junction with the preceding whorl. The two lower ones are smaller and oblique. The 

 teeth on the outer lip are generally two, placed close together near the middle, but there 

 is sometimes a third, smaller one, below them. The carina on the base is broad and 

 little elevated, immediately surrounding the umbilicus. The mouth is acutely angular 

 above and below. This shell attains a greater size than that mentioned above, as I have 

 an imperfect specimen larger than the one whose dimensions and figure are given. 



