INSTITUTE OF SCIENCE, PHILADELPHIA. 8/ 



' heavy, with a less poUshed surface, and belongs to a much earlier geological 

 horizon. 



The nucleus is large and blunt, followed by about four whorls, which are 

 spirally striated and show well-marked incremental lines. Between the angle 

 and the sutural sinus, which last is emphasized, the lip is somewhat concave. 

 In front of the angle it is nearly straight. There are four strong columellar 

 plaits. There are no traces of color on the outside of the shell, but the mid- 

 dle layer of the shell, when exposed by erosion, is of a very dark color, when 

 well preserved. In full-grown specimens there is a rather thick callus on the 

 body-whorl. The species reaches a size of 90 x 70 mm. The plaits are 

 rather thicker and closer together than in C. subcDigjilata of the same size. 



Specimens have been received only from the Upper Lignitic group of the 

 Alabama Eocene, considerably below the Claibornian, and were collected at 

 Bell's and Gregg's Landings, Alabama. 



Scaphella (Oaricella) subangulata Conrad. 



Plate 6, figure 11. 



Caricella subangulata Conrad, Wailes' Geol. Miss., p. 289, pi. xv. fig. 8, 1854. Proc. Acad. 



Nat. Sci. vii. p. 257, 1855. 



Shell rather large, thick, short-spired, pyriform, with five or six whorls ; 

 nucleus of the subgenus ; early whorls after the nucleus exhibiting the usual 

 spiral striation, which becomes obsolete ; suture very closely and firmly ap- 

 pressed, leaving the suture almost obscure; spire short-conic, the whorls 

 slightly swelling, the last much the largest, short, widest posteriorly, evenly 

 rounded over the periphery, rapidly attenuating to a short, pointed and some- 

 what recurved canal ; aperture wide behind, narrow in front ; outer lip in the 

 adult simple, sharp, receding deeply to the suture, with a strong callus at the 

 commissure ; the lip projects forward at the widest part of the shell and re- 

 cedes again to the canal, but much less suddenly ; inner lip moderately callous, 

 with four high, strong, subequal plaits, grooved behind, with the anterior plait 

 the weakest; canal short, slightly constricted and recurved, with a perceptible 

 fascicle, striated spirally on the back, the middle part of the whorl smooth or 

 marked only by fine incremental striae. Max. Ion. of shell 57.0; of aperture 

 47.0 ; max. diam. 42.0 mm. 



Collected at Moody's Branch, near Jackson, Miss., and four and a half 

 miles east of Shubuta, Miss., in the Upper Eocene or " Jackson " group of 

 strata. Also from " Creole Bluff, " Louisiana. 



This form is related to 5. Heilprini and to 5. podagrina Dall of the Upper 

 Lignitic horizon, and still more closely to C. pyridoides Conrad, of which it 

 may prove only a specially exuberant variety. Conrad's figure represents the 

 suture with a ridge before it instead of closely and smoothly appressed as the 

 type-specimen shows it to be. But the figures in Wailes' Report are none of 

 them very exact. This species does not attain more than three-fifths the size 



