152 BULLETUN 181, XINIT'EiD STATE® NlAlTTOOSriAlL MUSEIUM 



BUCKLEYIA BICINCTA, new species 

 Plate 19, Figures 13-15 



Shell disk shaped, concave on both the upper and lower surface, 

 dark olive-green with vvhitish axial bands, which are rather irregu- 

 lar in outline and of varying width but of rather regular spacing. 

 The nucleus consists of almost one turn, which is followed by a 

 portion having spiral threads, and this in turn is succeeded by a 

 part which has 2 strong keels at a considerable distance anterior and 

 posterior to the periphery. The slightly rounded space between these 

 two keels is marked by 22 slender spiral threads, as well as incremen- 

 tal lines. On the upper surface there is a moderately strong spiral 

 thread almost median between the supraperipheral keel and the 

 suture. There are 20 slender hairlines between this and the supra- 

 peripheral keel, and 18 between it and the suture on the upper sur- 

 face. On the lower surface there is a sunilar arrangement, 22 spiral 

 threads being present between the strong subperipheral keel and 

 the median cord and 16 between it and the suture. Suture well im- 

 pressed, showing the spiral keel on both the upper and lower surface. 

 Aperture with the upper and lower lip evenly curved; the outer 

 lip is less arched and rendered eared by the two spiral keels. The 

 parietal lip corresponds in arching to the outer. 



The type, U.S.N.M. No. 316063, comes from Ecuador without 

 specific locality designation. It has 4.4 whorls and measures : Height, 

 5.2 mm., greater diameter, 16.5 mm.; lesser diameter, 12.8 mm. 



The strong 2-keeled aspect of the shell readily differentiates this 

 from the other two species. 



BUCKLEYIA MARTINEZI (Hidalgo) 



Plate 19, Figuees 19-21 



1866. CyclopJiorus martinezi Hidalgo, Journ. Conchy!., vol. 14, p. 273, pi. 8, fig. 5. 



1872. Aperostoma (Buckleyia) montezumi Higgins, Proc. Zool. Soc. London, 



1872, p. 686, pi. 56, fig. 7. 



1873. BucJcleya martinezi Mousson, Malakoz. Blatter, vol. 21, p. 17. 



Shell disk shaped, concave on both the upper and lower surface, 

 sides olive-green with paler axial bands; these vary considerably in 

 width and spacing. The nucleus consists of a fraction of a turn and 

 is smooth. This is followed by a spirally Urate portion, which in 

 turn is succeeded by a part bearing 4 strong keels, which are of about 

 equal strength and spacing. Two of these are on each side of the 

 periphery and the other two separated from them by a space as wide 

 as the one that separates these two keels, one above and the other 

 below on the base. The spaces between these keels are concave and 

 marked by several fine spiral threads and rather strong threadlike 



