328 TRANSACTIONS OF THE WAGNER FREE 



S. arncemim Conr. closely resembles S. trilineahtvi, but has two deep sulci 

 around the umbilicus instead of one, and has three very clear-cut, strong 

 peripheral keels, those of trilineahim being weaker. It is very close to the 

 Miocene shell. 5. ammnim has been received from VVahtubbee, Claiborne, 

 and Orangeburg, S. C. 



5. Jofmsoni n. s. (pi. 22, figs. 15, 15 a) is about the size of 5. amcenum 

 and somewhat more elevated ; the sculpture of the spire is very similar to that 

 oi amcenum, but the periphery has two broad, elegantly articulated ribs, sepa- 

 rated by a sharp groove, and the base with six or seven sharp spiral grooves, 

 with the interspaces of the first four articulated and wider, and those outside 

 of them gradually narrower toward the margin; the umbilicus is, like that of 

 am&mim, excavated, but with strong transverse wrinkles. A shell of six 

 whorls beside the nucleus measures: alt. 5.0; max. diam. 8.5 mm. It some- 

 times attains a larger size. It is from the Claiborne Sands. 



^. textilinum n. s. (pi. 22, figs, i, 2, 3), from the Wahtubbee, is a mod- 

 erately-sized, rather depressed shell of seven whorls beside the sunken nucleus ; 

 in front of the suture is a rather broad tubercular or fluctuated elevated band, 

 more than half way to the periphery is another a little less in size, and the 

 peripheral keel is a still smaller thread of the same kind ; between the first two 

 are four small threads, and between the second and the keel are several ex- 

 tremely fine grooves; all these are crossed by obliquely radial, close-set, deep, 

 narrow grooves ; the periphery is rather high on the whorl ; the umbilical rib 

 is broad, rope-like, with sharp oblique ridges across it; outside of the narrow 

 umbilical sulcus three very fine and three broad articulated spirals alternate, 

 then three fine ones, followed by a very elevated, fluctuated thread, between 

 which and the peripheral keel are four or more very fine threads; all the small 

 threads are cut by radial grooves like those on the upper surface ; the umbil- 

 icus is small, its wall deeply excavated; the aperture but for the sculpture 

 would be rounded, the end of the umbilical rib is very deeply grooved. Alt. 

 6.5 ; diam. of shell 12.0 ; of umbilicus 2.0 mm. This is one of the most elegant 

 shells of our Tertiary, and most nearly related to the Miocene S. iiupemm, 

 which is known by its rounded whorls, nearly channelled suture with a thick 

 cord in front of it, and uniformly sculptured surface, with the peripheral keel 

 nearly obsolete in the adult, so far as rising above the other sculpture is con- 

 cerned. 



Finally we close our list with the well-known 5. granulattnn Lam., which 

 is the S. perspectwa, T. and H. non Linne, which has existed since later Mio- 

 cene times. The fossil specimens are rather more granulose than the recent 

 ones, as in the case of the Nassas, but this is hardly pronounced enough to be 

 dignified by a varietal name, and even Conrad refrained from baptizing it. 

 The Jamaica Miocene variety qjiadriseriatum Sby. is slightly more flattened 

 above the periphery than the type. 



