NO. 1569. WEST AMERICAN MOLLUSKS—BARTSCH. 253 



TRIPHORIS HEMPHILLI, new species. 

 Plate XVI, fig. 12. 



Shell sinistral, elongate-conic, chestnut brown. (Nuclear whorls 

 decollated.) Succeeding turns separated by strong channeled 

 sutures, ornamented on the fii-st five turns by a double spiral row of 

 tubercles which are separated by a channel a little wider than the 

 tubercles. Beginning with the sixth tiu'n, a slender, spiral, faintly 

 tuberculate keel, placed a little nearer the posterior than the supra- 

 sutural row of tubercles, makes its appearance in the channel. This 

 keel remains slender and does not quite attain the strength of the 

 suprasutural one, even on the last turn. The tubercles are joined 

 spirally by quite strong connections and axially by moderately 

 strong riblets. The spaces inclosed by these joining elements appear 

 as elongated pits, of which the axial axis is the longest. There are 

 sixteen tubercles upon the second and twent3^-two upon the penulti- 

 mate turn. The tubercles, as well as their spiral connections, are 

 somewhat excavated posteriorly, but well rounded anteriorly, and 

 the posterior row "of tubercles is considerably more strongly developed 

 than the suprasutural on the last five turns. In addition to the 

 sculpture descril)ed, the entire surface of the spire, tubercles, and 

 intertubercular spaces are marked by slender lines of growth. Periph- 

 ery of the last whorl, marked by a tubercular cord, a little less strongly 

 developed than the suprasutural one. Base rather elongated, marked 

 b}' two rather broad, low, spiral cords, the anterior one of which is 

 partly situated upon the columella. The well rounded channel, 

 which separates these keels, as well as the supraperipheral channel, 

 are crossed by weak continuations of the axial riblets. Aperture 

 decidedly channeled anteriorly, posterior angle obtuse; columella 

 thick and twisted, covered with a thick callus, which extends over 

 the parietal wall. 



The type has ten post-nuclear whorls and measures: Length, 5.1 

 mm.; diameter, 1.6 mm. It and two additional specimens are 

 entered as Cat. No. 106428, U.S.N.M. They were collected by Mr. 

 Henry Hemphill from shell washings at Point Abreojos, Lower 

 California. 



TRIPHORIS CATALIN^NSIS, new species. 



Plate XVI, fig. IS. 



Shell sinistral, elongate-conic, rather stout, with the posterior 

 half of the exposed portion of the whorls white and the anterior half 

 light bro\\ai. (Part of the nuclear whorls decollated.) The three and 

 one-half remaining turns of the nucleus increase regularly in size and 

 are marked by about twenty-six slender axial riblets on the first and 

 thirty-two on the next and the third whorl. In addition to these 

 riblets the nuclear whorls are encircled by two prominent sublamellai 



