214 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



The sculpture of this species is very similar to that of Triphora 

 peninsularis Bartsch,^- described from Lower California, but the figure 

 of that species shows considerable difference in shape, while the measure- 

 ments indicate that the Panama shell with an equal number of whorls 

 would be distinctly larger. 



This species is named for Dr. Edwin O. Palmer, physician, who 

 accompanied the expedition. 



Triphora marshi Strong & Hertlein, new species 



Plate 20, Figs. 2, 3 



Shell sinistral, regularly elongate-conic, lower portion of the whorls 

 white, upper portion, with the exception of the top of scattering 

 tubercles on the upper spiral cord, brown, the white-topped tubercles 

 being usually arranged in pairs ; spiral nuclear whorls 7, the first 2 

 smooth, darker than the following whorls, which are sculptured with 

 2 spiral cords and slender axial ribs, of which about 30 appear on the 

 last whorl; of the 2 spiral cords one is situated on the middle of the 

 whorls and the other about half way between it and the base; post- 

 nuclear whorls 10, sutures indistinct; spiral sculpture on the early 

 whorls consisting of 2 nodulous cords, of which one is at the summit 

 and the other only a little above the suture ; beginning at about the 

 sixth whorl a median spiral cord begins to develop, a little nearer to 

 the posterior than the anterior cord : this gradually increases in strength 

 until on the last whorl it nearly equals the other 2 in strength; axial 

 sculpture of slender, retractive ribs connecting the nodules of the spiral 

 cords: of these, 20 appear on all except the first 2 whorls, where there 

 are a few less; the nodules of the upper spiral cord are well rounded 

 and slightly more prominent than those on the lower spiral cord, on 

 which they are truncated on the posterior face; the nodules on the 

 median cord are also posteriorly truncated ; the spaces inclosed by the 

 spiral cords and axial ribs are well-impressed rectangular pits; periphery 

 of the last whorl marked by a nodulous cord which is separated from 

 the suprasutural cord by a narrow channel ; below this on the base are 

 2 spiral cords only a little less strong, of which the upper is feebly nodu- 

 lous; aperture irregular, outer lip thin, the basal portion expanded and 

 roofing over the anterior canal and columella. The type measures: 

 length, 4.66 mm; diameter, 1.33 mm. It has lost the first 4 nuclear 



42 Triphoris peninsularis Bartsch, Proc. U. S. Nat. Mus., vol. 33, December 

 12, 1907, p. 255, pi. 16, fig. 2. "Point Abreojos, Lower California." 



