72 BULLETIN OF THE 



Marginella fusina n. s. 



Shell ovate-fusiform, with the spire nearly as long as the aperture, polished 

 waxen white, five-whorled ; whorls of the spire well marked and rotundate 

 though covered with a transparent glaze; suture distinct ; apex rounded ; lines 

 of growth perceptible under the glaze, especially near the suture on the last 

 whorl ; aperture short, lunate, with no posterior angle in the outer lip, which 

 gently rounds to the body whorl before and behind ; outer lip a little thick- 

 ened inside, simple, not reflected ; folds four, the two anterior ones very ob- 

 lique and close together ; canal not flaring, short, and not twisted backward. 

 Lon. of shell, 8.0; of last whorl, 6.0 ; of aperture, 4.5. Max. lat. 4.0 ; lat. of 

 aperture, 1.5 mm. 



Yucatan Strait, 640 fms. 



This has somewhat the shape of Marginella nodata in a general Avay, but is 

 more evenly fusiform, and quite peculiar in its even taper, which does not 

 seem to be ascribed to any other species. 



Marginella seminula n. s. 



This species differs from the last by its proportionally shorter spire contain- 

 in"- one less whorl ; by the less distinctly marked suture ; by the shouldering 

 of the last whorl which angulates the outer lip in adult specimens, the lip in 

 this vicinity being generally much thickened and slightly reflected, somewhat 

 produced in the middle, and thinning toward the distinctly flaring canal ; the 

 columellar folds are more evenly separated, and the canal is slightly recurved. 

 In other respects it resembles* M. fusina. Lon. of shell, 7.0 ; of last whorl, 

 5.62 ; of aperture, 5.12. Lat. of sheU, 3.5 ; of aperture, 1.25 mm. 



Yucatan Strait, 640 fms. 



There is some variation in size and in the way in which the outer lip is 

 thickened in difi"erent individuals. The shape is not far from that of M. 

 festiva. The measurements are of the largest of several specimens. 



M. (var. ?) Yucatecana. 



Shell with three and a half to four whorls, smaller than the last and the 

 adult specimens proportionally more slender and of a distinctly diff'erent shape ; 

 but some of the younger specimens of M. seminula, before they have put on 

 the lip-callus and its angulation, appear much more similar, and suggest that 

 the range of variation may be wide enough to cover both. The present form, 

 with a proportionately shorter spire and longer and wider aperture, has an 

 evenly rounded outer lip and body whorl, which recalls M. fusina. Its chiet 

 diff'erences from M. seminula consist in those features which accompany the 

 shouldering of the whorls and the thickening of the outer lip, which in this 

 form seems to be always evenly rounded, arched forward, and hardly thick- 



