142 Trans. Acad. Sci. of St. Louis. 



species and by the elongate spire, very short and rather 

 oblique aperture, broad shallow sinus formed upon a double 

 submedian and more or less nodulose peripheral elevation and 

 very short, broadly obtuse paucispiral embryo. The three 

 species represented by material in my cabinet may be distin- 

 guished among themselves as follows : — 



Nodules of the peripheral carinae smaller, not coalescent longitudi- 

 nally; aperture one-third as long as the shell or nearly so 2 



Nodules of tbe peripheral carinae coarser, each being fused with its op- 

 posite, forming large longitudinal nodules; spire relatively more 

 elongate, the aperture about a fourth as long as the shell 3 



2 — Spiral carinules relatively coarser, generally two in number between 

 the central double peripheral carina and the lower margin; lower of 

 the two subsutural carinae nodulose; lines of growth very coarse, 

 cancellating the body whorl below the convexity. Length of a 

 specimen of 5 body whorls, 7 mm.; width, 2.6 mm. Upper Claiborne 

 ferruginous sand terebriformis Meyer 



Spiral carinules flue; spire whorls shorter and more transverse, the 

 second carinule below the suture simple and not nodulose; but one 

 raised line between the periphery and lower margin and another 

 forming the latter; space between the nodulose peripheral carinae and 

 subsutural carinules much longer, being twice as long as the width of 

 the peripheral band; lines of growth distinct and uneven but feebler than 

 in terebriformis. Length of a specimen of about 7 body whorls, 10 mm. ; 

 width, 3 mm. Lower Claiborne Eocene of St. Maurice, La . . obtusa n. sp. 



3 — Form very slender; subsutural carinae simple, very coarse and nearly 

 contiguous; peripheral carinae coarse, separated from the subsutural by 

 a concave space which is subequal in length to the width of the peri- 

 pheral duplex band and having two fine but strongly elevated and very 

 approximate spiral threads; space below the peripheral nodulose 

 band but little longer than the width of the latter and having 

 one coarse carinule and another forming the lower margin; lines of 

 growth strong and uneven on the body whorl below the convexity. 

 Length of a specimen of 9 body whorls, 10.6 mm.; width, 2.8 mm. 

 Lower Claiborne Eocene of Moseley's Ferry, Burleson Co., 

 Texas longispira n. sp. 



In terebriformis the spiral depression below the subsutural 

 carinae is only about as long as the width of the duplex peri- 

 pheral band, while in obtusa it is fully twice as long as the 

 latter, giving these two species a distinctly different facies. 

 Longispira is widely different, and, besides the characters 

 noted in the table, has a still shorter, more obtuse and 

 scarcely at all reflexed beak, which is sometimes umbilicate 

 along the callus of the inner lip ; it was collected in consid- 



