254 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



slender, finely tuberculate spiral keels, which are placed about equi- 

 distant from the sutures and are a little nearer to each other than to 

 the sutures. The anterior one of these keels is much more strongly- 

 developed on the last nuclear turn than the posterior member. The 

 intersection of the spiral keels and axial riblets are tuberculate. The 

 whorls have a strong sloping shoulder which extends from the posterior 

 keel to the summit. Post-nuclear w^iorls separated by strongly marked 

 sutures, ornamented by two spiral rows of nodules, of wliich the pos- 

 terior one is the stronger. These tw^o rows of nodules are separated 

 on the first seven post-nuclear whorls by a spiral channel almost as 

 wide as the suture. From the seventh post-nuclear whorl on, a slen- 

 der, spiral, weakly tuberculate cord makes its appearance in the chan- 

 nel, growing stronger with each succeeding turn. This cord is situ- 

 ated a little nearer the posterior row of tubercles than the anterior, and 

 like the posterior row of tubercles is white. The tubercles are con- 

 nected by blunt, ill-deiuied, axial riblets. There are about twenty 

 tubercles on the first and fifth post-nuclear whorls and twenty-four 

 upon the penultimate turn. In addition to the strong sculpture just 

 defined, the entire surface, tubercles and depressions, are crossed by 

 many fine lines of growth and spiral striations. Periphery of the last 

 whorl marked by a slender, weakly tuberculate keel. Base exceed- 

 ingly short, almost flat, crossed by strong lines of growth and fuie spiral 

 striations, marked by a brown band at the insertion of the columella. 

 Aperture subquadrate, outer lip sinuous, conforming wdth the exter- 

 nal sculpture, basal wall slightly concave ; columella very stout, short, 

 and strongly twisted. Basal channel well developed. 



The type, wliich is unique— Cat. No. 193998, U.S.N.M.— is an imma- 

 ture specimen and comes from Catalina Island, California. It has ten 

 post-nuclear whorls and measures: Length, 5.3 mm.; diameter, 

 2.2 mm. 



TRIPHORIS STEARNSI, new species. 

 Plate XVI, fig. 3. 



Shell elongate-conic, sinistral, flesh colored. (Early whorls decol- 

 lated.) The nine remaining are moderately high, marked by a double 

 spiral row of very strong, equally developed, rounded tubercles, which 

 are separated on the first three turns by a channel as deep and well 

 marked as the sutures. This space between the tw^o rows of tubercles 

 gradually develops into a slender tuberculate keel, which on the last 

 turn is about half as wide as the tubercular ridges. There are about 

 eighteen tubercles on the tiiird to seventh of the remaining wdiorls 

 and twenty on the penultimate. Periphery angulated. Base short, 

 marked by two strong spiral keels. (Aperture fractured.) 



The type, Cat. No. 32259, U.S.N.M., belongs to the Stearns collec- 

 tion and was found in the Gulf of California. It measures: Length, 

 4.1 mm.; diameter, 1.4 mm. 



