NO. 2207. WEST AMERICAN MELANELLID M0LLU8KS—BARTSCII. 347 



Spire acuminate. Apex rather obtuse. Whorls 10, slowly increas- 

 ing in size, flattened; the final whorl large, its altitude half of that 

 of the entire shell. Suture simple. Aperture elongate, p}Tiform, 

 the margins thickened, yellowish; the left margin strongly reflected 

 at the base. Long., 0.005; diam., 0.0015. 



"This small shell is very remarkable by reason of its elements; 

 elongated, acuminated outline. The spire is made up of six w^horls, 

 which increase slowly in diameter, and which are joined together 

 by a very simple suture. The sides of these whorls are straight, 

 smooth, witliout convexity, and the suture appears only as a feeble 

 line, revolvmg about the shell, so that the shell does not seem to 

 be interrupted at the suture line. The final whorl occupies approxi- 

 mately half of the entire altitude and is imperforate, despite the fact 

 that a slight elongated depression, covered in part by the reflected 

 left margin of the aperture, seems to form a convexity which at 

 first sight simulates a perforation. The acuminate outline of the 

 entire shell attenuates slightly the half acute, half obtuse outline of 

 the apex so that it may be considered as acute. The aperture is 

 entirely elongate, pyriform, the two margins colored a dark brown, 

 rounding smoothly into each other. The left is reflected upon the 

 columella, and spreads out over the base of the last whorl. It is 

 not only the exceedingly graceful outline of Eulima elegantissima 

 which makes this shell remarkable, it is also the exceedingly high 

 luster with which it shines, and its transparency, equal to that of 

 pure crystal. The luster is due to its perfect polish and also to its 

 clearness. Each of the whorls is ornamented with two yellow ribbons 

 which follow the spire. The color is rather deep along the middle 

 of each ribbon. It lightens toward the margins and almost merges 

 into the crystalline background. It is the same with the elongate 

 spots, which, bending obliquely toward the left bmd the ribbons 

 to one another. The total of these characteristics give to Eulima 

 elegantissima an aspect like that of marble. The shell near the 

 suture seems to be thicker than away from it. Along the last w^horls 

 especially it seems as if there were a little ribbon almost opaque, 

 which makes the sheU at this point seem whiter. 



''Type ZocdZii//.— Negritos; or Margarita Island, Panama." 

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

 and figure. 



STROMBIFORMIS ACUTA Sowerby. 



Plate 47, fig. 2. 



Eulima acuta Sowerby, Proc. Zool. Soc. London, 1834. p. 8. 

 Leiostraca acuta Sowerby, Thes. Conch., 1854, p. 803, pi. 170, fig. 11. 



"Acutely turreted, white; whorls 12, smooth, sutures obsolete, 

 varices few. 



"Bay of Montiji, Central America. (IMus. Ciuning.) 



