THE CYCIiOPHORTD LAND M0LLUSK9 OF AMERICA 149 



gantly, closely rib-striately sculptured ; the last exceeds one-fourth the 

 length of the shell. Suture profound, excavated; aperture circular, 

 straight; peristome straight, continuous, reflectedly expanded. 

 Length, 2 mm. ; diameter, 1 mm. Diameter of aperture, 6 mm. Oper- 

 culum small, concave, circular, with concentric and spiral striations, 

 slightly yellowish. 



Radula formula : 5 : 4 : 4 : 2. 



The locality as given by Doering is Sierra de Tucuman, Argentina. 



ADELOPOMA STOLLI (von Martens) 

 Plate 40, Figxjees 2, 3 



1890. Diplommatina stolli von Martens, Biologia Centrali-Americana, p. 20, 



pi. 1, fig. 19. 

 1898. Palaina (Eupalaina) stolli Kobelt and Moixendorff, Nachrb. Deut. 



Malak. Ges., vol. 30, p. 133. 

 1902. Adelopoma stolli Kobelt, Das Tierreich, Cyclophoridae, p. 480. 



We have not seen specimens of this species and therefore must 

 give a translation of v. Martens' description and copy his figure : 



Shell sinistral, imperforate, ovate-conic, with 16 strong ribs on the 

 penultimate whorl, white ; whorls 6, convex, the first 2 smooth, yellow- 

 ish, the penultimate the largest, the last a little narrower, rounded 

 and thin ; aperture subvertical, circular ; peristome continuous, thick- 

 ened, expanded, white. Length, 2.5 mm. ; diameter, 1 mm. Aperture 

 0.75 mm. 



Habitat: Northwest Guatemala in the District of Cholhuitz, on 

 the slope of the Volcano Santa Maria at the plantation Helvetia, 

 where 2 specimens were found by O. Stoll on the ground in 

 second growth woods. 



Comparing the specimens with Adelopoma occidentale from Trini- 

 dad, the riblets in A. stolli are very much stronger and less 

 numerous. 



Hinkley (Nautilus, vol. 21, p. 78, 1907), reports this species from 

 Tampico, where a single specimen was found. We have seen this 

 specimen, but unfortunately it was so badly fractured that we were 

 unable to make any comparison. Judging from the distribution, 

 we rather doubt its identity. It is possible that this represents a 

 distinct form. 



ADELOPOMA BAKERI, new species 



Plate 40, Figueb 5 



1923. Adelopoma occidentale H. B. Bakeb, Occ. Pap. Mus. Zool. Univ. Michigan, 

 No. 137, pp. 46-48, fig. 21 (radula). 



Shell minute, sinistral, pupoid, white. The nucleus consists of 1.5 

 inflated mammillated turns, which are smooth. The postnuclear 



