NO. 2207. WEST AMERICAN MELANELLID MOLLUSKS—BARTSCH. 335 



at the base. A simple suture, similar to that of the preceding species, 

 unites these 10 whorls. The aperture is subquadrate, acute at the 

 point of union of the right margin with that of the final whorl. The 

 right margin is simple, very slightly thickened. It is feebly reflected 

 and merges smoothly into the left margin, which, with the increasing 

 reflection of the margin, is spread out over the final whorl, and the 

 columella. This species is almost opaque, colored in an opaline sliade, 

 which is very pronounced on the final wliorls. On the medial por- 

 tion of the shell the carmine tints of the spire are lost in the back- 

 ground. 



" Type locality. — Negritos; or Maigarita Island, Panama." 

 I luive not seen specimens of this species and quote the description 

 and figure. 



SABINELLA7 PTILOCRINICOLA Bartsch. 



Plate 44, fig. 2. 



Eulivia ptilocrinicola Bartsch, Proc. U. S. Nat. Museum, vol. 32, 1907, pp. 

 555-556, pi. 53. 



Shell elongate-conic, tliin, polished, transparent, tinged with 

 bluish-white (the dried animal showing through the upper whorls as 

 a granular golden-yellow mass.) Whorls 11, increasing regularly in 

 size, decidedly rounded, with the surface weakly malleated, having a 

 few feebly developed varices wliich appear at irregular intervals as 

 narrow opaque vertical bands. Summit of the whorls closely 

 appressed to the preceding turn, the extreme edge forming a slender 

 spiral sutural band. Last whorl quite strongly inflated basally. 

 Periphery and base well rounded, marked like the spire. Aperture 

 moderately large, suboval; outer lip thin, evenly curved; inner lip 

 slender, vertical, shghtly reflected; parietal waU covered by a thin 

 caUus, Operculum thin, corneous. 



The type (Cat. No. 195373, U.S.N.M.) was dredged by the United 

 States Bureau of Fisheries steamer Albatross at station 3342, in 1,588 

 fathoms, off British Columbia, and measures — length, 9.5 mm.; 

 diameter, 3.9 mm. 



SABINELLA MERIDIONALIS, new species. 



Plate 43, fig. 3. 



Shell small, bluish-white, polished, marked by exceedingly fine fines 

 of growth only. Early whorls decollated, later ones well rounded, 

 separated by a moderately compressed suture. Periphery of the last 

 whorl weU rounded; base moderately long, well rounded. Aperture 

 very broadly oval; posterior angle acute; outer lip thin, decidedly 

 protracted in the middle between the posterior angle and the base; 

 inner lip slender, curved, reflected over and partly appressed to the 

 base posteriorly; parietal wall covered by a thin callus. 



