NO. 2207. WEST AMERICAN MELANELLID M0LLUSK8—B ARTSCH. 331 

 STROMBIFORMIS (BALCIS) BIPARTITA MSrch. 



Eulima bipartita Morch, Mai. Blat., vol. 6, 1860, pp. 120-121. 



"Shell shining, diaphanous, flexed to the right. Whorls 10, flattened, 

 divided by a spiral band a little below the middle; the upper band 

 white, the lower milk-white. Last whorl subangulated at the pe- 

 riphery. Aperture piriform, outer lip arcuate, produced; inner lip 

 straight, with a callus; parietal wall covered with a moderately thick 

 callus, which renders the peritreme complete. A series of impressed 

 varices form an oblique line on the right side. Length, 7.5 mm.; 

 diameter, 2.5 mm. Hab.: Sansonate Mexico. Three specimens with 

 broken apex." 



The above is a translation of Morch's description. I have so far 

 not seen specimens agreeing with it. 



MELANELLA (BALCIS) ADAMANTINA de FoHn. 



Plate 42, fig. 1. 

 Eulima adamantina De Folin, Les Meleagrinicoles, 1867, p. 62, pi. 6, fig. 2. 



"Shell very small, imperforate, elongate, arcuate, acuminate, very 

 highly polished, hyahne. Whorls nine in number, flattened, with a 

 barely perceptible suture. Altitude of body whorl equal to one third 

 that of the entire shell. Aperture semilunate; margins a little 

 thickened, the left slightly reflexed. Long., 0.0025, diam., 0.0008. 



"Nothing is more brilliant than this species of Eulima. The out- 

 line is very much elongated, although its apex, a little obtuse. The 

 altitude of the shell makes it appear acute. It is crystalline, ex- 

 tremely diaphanous, with a considerable luster. The spire is com- 

 posed of nine whorls, which at first increase showly. The curvature 

 of the spire is rather pronounced, turning the shell from right to left, 

 so that the right side is concave and the left side convex. The 

 whorls of the spire are united by a simple hnear suture, very finely 

 and very clearly traced. The transparency of the shell allows the 

 base of each of the whorls to be seen, and the shell is thickened a little 

 both above and below the suture. The final whorl is equal to about 

 one-third of the total altitude and it is imperforate. The aperture 

 is elongate and semicircular. Its margins are simple and joined very 

 sharp, and the left is slightly reflected and tiu*ned back upon the 

 columella. 



''Type locality. — Negritos, or Margarita Island, Panama." 



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

 and fionire. 



