THE NAUTILUS. 67 



This species differs conspicuously from C. imitatrix Bttg. 1 by its 

 mucli more slender contour and the sculpture of the last whorl, be- 

 sides various other details. C. melitensis Gatto, differs in sculpture, 

 shape and position of the lunella, etc. 



C. imitatrix was placed by Dr. Boettger in the sub-genus Papilli- 

 fera, noting that it is transitional to Albinaria. Westerlurid in his 

 latest monograph places imitatrix and melitensis in a new section, 

 Imitatrix, of Albinaria. The systematic position of G. imitatrix is 

 therefore somewhat uncertain, and as that species seems the most 

 closely related one to C. emersoniana, I assign the latter to the sub- 

 genus Papillifera with some doubt. However, from the shape and 

 curvature of the clausilium, I do not think it can be an Albinaria. 

 In sculpture and texture, the shells are much like Siciliaria. 



PARTI LA EMEKSONI n. sp. PI. IV, fig. 11. 



The shell is rather narrowly, half-covered umbilicate, elongate, 

 rather thin, Isabella color or of a slightly more olive shade, having 

 an extremely faint brown band below the periphery and a distinct 

 but narrow whitish border below the suture. Surface very glossy > 

 earlier whorls distinctly engraved spirally, but on the penultimate 

 whorl only the upper half is so engraved ; last whorl not spirally stri- 

 ate, but distinctly and rather coarsely matteate. Outlines of the spire 

 slightly convex, the summit obtuse. Whorls 5|, moderately convex, 

 the last somewhat flattened above the periphery, very convex beneath. 

 Suture moderately impressed, an inconspicuous cord immediately 

 above and partly covered by it in the intermediate whorls. Aper- 

 ture long ovate; peristome nearly white, well expanded and reflected, 

 slightly thickened within. 



Length 19.1, diam. 9.2, length of aperture with peristome 9.5 mm. 



The locality of this species is unfortunately not certain. It was 

 collected on one of the voyages of the " Morning Star," and is 

 labeled " Ponape." ? As it is of Melanesian type, and unlike the 

 known Caroline Island Partulas, this locality seems doubtful. The 

 species clearly belongs to the subgenus Melanesica, but is quite dis- 

 tinct from all known species by the conspicuous malleation and 

 absence of engraved spiral lines on the last whorl. Few other spe- 

 cies are so long and narrow as this. It is named in honor of Mr. 

 J. S. Emerson, of Honolulu. 



iJabrbiicber d. d. Malak. Ges. VI, p. 120, pi. 3, f. 13. Kobelt, Icono- 

 graphie, n. F. VI, p. 31, no. 1005. 



