150 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



last. The open umbilicus is likewise marked with slender spiral 

 threads. In addition to the spiral sculpture, the entire surface of 

 the shell is marked by numerous, retractively slanting, slender, raised, 

 axial threads, which are almost lamellar and are about one-fourth 

 as wide as the spaces that separate them; of these, about 65 occur on 

 the last turn. These threads run up on the sides of the strong spiral 

 keels, and may pass over them; in our specimen the keels are too 

 worn to determine this point. The axial sculpture is equally strong 

 on the spire and the base and even bends into the umbilicus. Aper- 

 ture very oblique, subcircular; outer lip rendered angulated by the 

 spiral cords; inner lip strongly curved and slightly reflected. 



The type, Cat. No. 250500, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1373). It has four whorls, and measures: Altitude, 4.7 

 mm.; greater diameter, 4.8 mm. 



Family TROCHIDAE. 



Genus CLANCULUS Montfort. 

 CLANCULUS MINIATUS Anton. 



Cat. No. 134, U.S.N.M., contains one specimen collected by Wil- 

 liam Stimpson on the North Pacific Exploring Expedition, at Simons 

 Bay, Cape of Good Hope. Cat. No. 18753, U.S.N.M., five specimens 

 .from Cape of Good Hope. Cat. No. 43096, U.S.N.M., four specimens 

 from the Cape of Good Hope. Cat. No. 186871, U.S.N.M., eight 

 specimens from Port Alfred (Coll. No. 241). Cat. No. 187104, 

 U.S.N.M., one specimen from the same locality (Coll. No. 649). 



CLANCULUS ALFREDENSIS, new species. 

 Plate 23, figs. 10, 11, 12. 



Shell broadly conic, rose colored, obscurely clouded with brown. 

 The first turn of the nucleus is strongly rounded and smooth, the 

 next is marked by three strong, spiral keels which divide the spaces 

 between the sutures into four equal parts. On the next whorl a 

 fourth keel makes its appearance between the summit and the 

 first keel anterior to it. On this whorl, the lines of growth assume 

 the form of slender threads. The post-nuclear whorls are marked 

 by two strong angles, one of which is at the periphery and the other 

 half-way between this and the summit. Each of these angles bears 

 a strong tuberculated cord. Between the median angle and the 

 summit of the whorls two tuberculated spiral cords occur upon the 

 first turn, three on the second, and four upon the last, the cord at 

 the summit having the strongest tubercles in each instance. Between 

 the peripheral cord and the median there is a faint thread upon 

 the first whorl, three nodulous cords on the second, of which the 

 median is the strongest, and five on the last. All of these cords are 



