146 Trans. Acad. Sci. of St. Louis. 
in Protosurcula, but the peculiar narrow elevated embryo, per - 
fectly smooth throughout and without riblets, higher shoulder 
angle and oblique fasciolar surface, less developed subsutural 
collar and some other differential characters, will readily serve 
to separate the two genera, which are perhaps the most charac- 
teristic and abundant forms of the Lower Claiborne Eocene, — 
and impart a marked difference in habitus. The species are 
more numerous than those of the preceding genus, those 
known to me being outlined as follows : — 
Peripheral carina crenulate, at least on the small upper body whorls, situated 
at the middle and Subduplex... 2.20. ccccc sc ceencccecerrcesecesscecs 2 
Peripheral carina devoid of any trace of crenulation at any point......... 5 
2— Larger species, the peripheral carina at or above the middle of the whorls, 
crenulate on the smallor nepionic whorls Only......--+s.-ceseeseee DB 
Small species, the periphery more obtusely angulate, more feebly carinate 
and distinctly below the middle of the whorls; all the whorls apparently 
crenulate on the periphery........+.seeseee- die le’sfo'etlofereletielelfetnle ntelehetne ts ae 
3— Peripheral carina at the middle of the whorls, apparently duplex, coarse 
but only moderately elavated; between it and the base there is another 
similar double carina; slightly above it, at the lower part of the oblique 
fasciolar surface, there is a fine spiral carina; declivous space thence 
to the fine subsutural collar with two or three very fine spiral threads. 
Texas, Caldwell Cosa sce cricelncee cue ce tispacies t onbs ee se MOOG! (GANG 
Peripheral carina well above the middle of the whorls; between it and 
the base there are two carinae, which are apparently smaller than 
the peripheral and less elevated. Lignitic Eocene of Wood’s Bluff, 
Ala. cece cccccccnvcccccceccccecscccee secs cccsccsccs cece ssttomeyi Ald. 
4 — Moderately stout, the subsutural collar small; surface thence regularly 
ascending to the crenulate periphery and having two or three 
coarse but feeble spiral lines; surface below the periphery on the spire 
whorls with two rather coarse and widely spaced carinules in low relief; 
below these on the body whorl the surface is closely, evenly lyrate. 
Upper Claiborne ferruginous sand [Conus].......-pulcherrima Heilp. 
5 — Peripheral carina double, its upper carinule smaller and less prominent 
than the lower, the latter a little below the middle; subsutural carina 
unusually strong, at some distance below the suture, the surface 
thence to the upper peripheral carina regularly oblique, with a single 
carinule ‘at lower two-fifths; on the larger whorls a few other very 
minute and inconspicuous threads can be observed; surface below the 
lower peripheral carina, with two carinae, the uppermost interval thus 
formed much the larger, both with an intermediate central and feeble 
thread; lyrae on the body whorl moderately coarse, well separated and 
only occasionally with intermediate threads. Length of a specimen of 6 
body whorls, 22mm.; width,6mm. Lower Claiborne Eocene of Lisbon, 
Ale cccccccccccsess cvccvevcccccevceccccvc cccccesc coco eCONCINNA 0. Sp. 
Peripheral carina single, narrow but strongly elevated, at the middle; sub- 
sutural carina, fine; surface thence to the periphery regularly oblique 
