164 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



and broadest of these being at the summit, the next in strength being 

 a median, while the third is a little less strong and is a little posterior 

 to the periphery. On the second turn the first cord splits, the two 

 elements becoming equal in strength eventually. The spaces which 

 separate the cords are strongly impressed spiral grooves. The axial 

 sculpture consists of rather broad, low ribs, the intersection of which 

 with the spiral sculpture form well marked tubercles. In the broad 

 spiral grooves which separate the spiral cords there appear numerous 

 fine axial threads. Sutures strongly channeled. Periphery of the 

 last whorl marked by a spiral cord a little less strong than the first 

 supraperipheral cord. Base short, broadly, openly urnbilicated, well 

 rounded, having six weakly tuberculated spiral cords between the 

 peripheral cord and the umbilicus, the last one marking the edge of 

 the umbilicus. These cords are of equal strength, and are separated 

 by strong sulci almost as wide as the cords, which are crossed by 

 numerous very fine axial threads. There is another spiral cord im- 

 mediately within the umbilicus. The rest of the umbilicus is marked 

 by fine axial threads only. Aperture oblique, subcyhndric; pos- 

 terior angle obtuse; outer lip rendered sinuous by the external sculp- 

 ture; inner lip very thick, almost straight on the outer edge, the 

 inner strongly curved; parietal wall glazed with a thick callus. 



The type and another specimen, Cat. No. 250515, U.S.N.M., come 

 from Port Alfred (Coll. No. 1388). The type has a little more than 

 one and one-half whorls, and measures: Altitude, 5.5 m m .; greater 

 diameter, 7 mm. Cat. No. 250552, U.S.N.M., contains four young 

 specimens of the same species, also from Port Alfred (Coll. No. 1425). 



CYNISCA ALFREDENSIS, n«w species. 

 Plate 29, figs. 10, 11, 12. 



Shell depressed helicoid ; bluish white, irregularly spotted with dots 

 of carmine red on the upper surface. Nuclear whorls badly worn 

 in all our specimens; the succeeding turns ornamented between the 

 sutures by three strong spiral cords which are feebly tuberculated. 

 The first of these cords is a little anterior to the summit, the space 

 between the summit and the cord being almost as wide as the space 

 between the first and median cords. The third cord is quite a bit 

 posterior to the suture. The four sulci separating these three cords 

 are deep and rounded and are crossed by very numerous, very fine, 

 axial threads. Periphery of the last whorl marked by a spiral cord 

 as strong as those between the sutures, which is separated from the 

 first supraperipheral cord by a sulcus almost as wide as those on the 

 spire and like these crossed by numerous fine axial fines. Base 

 moderately rounded, marked with three strong spiral cords, of which 

 the one joining the umbilicus is about twice as wide as the others. 

 The three grooves separating these cords are about as wide as the 



