322 PROCEEDINGS OF THE ACADEMY OF 



obliquely flattened on the sides ; inferior angle carinate ; lower surface broad- 

 ly convex. Mouth obliquely subquadrate. Umbilicus of ordinary propor- 

 tions and perspective. Umbilical surface of whorls rounded. Surface marked 

 by small but well marked revolving and longitudinal depressed lines, produc- 

 ing a cancellated appearance. 



Height, -8 in. Width of body whorl, 1*4 in. Height of mouth, -5 in. Trans- 

 verse width of mouth, "65 in. (about ) 



My collection ; locality, Mullica Hill ; from Mr. Abbott. Several specimens 

 in the Collection of the Academy from Timber Creek, N. J., with surfaces 

 entirely obliterated. One specimen, also, in the Collection of the Academy, 

 seems, from its lithological character, to have come from the white limestone 

 of Prairie Bluff, Ala. 



This shell is of the general form of Pleurotomaria perspectiva Sow., as figured 

 by d'Orb., Pal.| Fr. vol. 2, pi. 186, but is always smaller, not as high propor- 

 tionally ; the lower angle of the body whorl is more acute, and the markings 

 are different. 



From A. crotaloides {Cirrus id. Morton, Pleurotomaria id. d'Orb, Auct.) it can 

 be distinguished by the higher spire, and flattened, angular whorls. The 

 surface markings of the latter species are entirely unknown. 



Fasciolaria Lam. 



F. Slackii. Elongated fusiform; spire turrited, about as high as the 

 mouth. Whorls five ? (,the upper one is broken off, but from the width of the 

 spire at that point, there must have been at least one volution in addition to 

 the four in the specimen.) Upper whorls prominent in the middle, sloping 

 gently upwards to the upper edge, which is so flattened as to indicate that 

 the suture must have been plain, not impressed, body whorl sloping from the 

 broad rounded shoulder, gently into a long, somewhat broad canal. Mouth 

 acute above, rapidly widening for a short distance and then gradually nar- 

 rowing. Surface marked by numerous undulating longitudinal ribs, passing 

 straight down or obliquely backwards from the suture to the shoulder of the 

 whorl, on which they change their direction, being inclined forwards and 

 downwards with a regular curve, Losing themselves in the general surface, or 

 extending to the end of the canal. One very distinct, oblique rib on the mid- 

 dle of the columella. 



Length of the specimen, containing four whorls, 1*2 in. Width of body 

 whorl, -6 in. Length of mouth, -7 in., (perhaps, when perfect, -75 or -8 in. 



Found with the two species of Action, described above. My collection, 

 from Dr. Slack. 



Resembles in- form, Fusus ezilis Con., (Median Tert. pi. 49, f. 4,) from the 

 Miocene, but is smaller,, the shoulder of the whorls is somewhat more strongly 

 marked, and the ribs are closer together than those of the costate variety of 

 that species. 



Voluta Linn. 



V. (Fasciolaria?) D el aw are n si s. Low fusiform; spire slightly ele- 

 vated ; whorls five, flattened and sloping above, marked on the angle by 

 obtuse tubercles, twelve on the body whorl, which extend in the shape of 

 rounded ribs, or mere undulations, about half the length of the whorl, losing 

 themselves in the surface. Mouth subangular above ; upper inner edge at 

 nearly a right angle to the inner lip ; outer lip, at first gently curved outward- 

 ly, and afterwards gradually approaching the anterior end with nearly a 

 straight line. The greatest width of the mouth appears to have equalled 

 about a third of its length. One heavy oblique fold on the columella. 



From the Delaware and Chesapeake Canal. Coll. Acad. 



This species is described from three casts in the Collection of the Academy. 

 They exhibit traces of the lines of growth, and of small regular revolving ribs. 



[Oct. 



