SYNAPTERPES. 227 



arcuate, obliquely a little truncate, the basal and outer mar- 

 gins acute. Length. 8, diam. 2, aperture 1.5 x 1 mm. 

 (Crosse et Fisch.). 



Guatemala: woods of Peten, near San Luis. (Morelet). 



Achatina cylindrella MORELET, Test. Noviss. ii, p. 12 (1851). 

 -PFR., Monogr. iii, p. 502. Subulina c., CROSSE et FISCHER, 

 Miss. Sci.^lex., Moll., p. 634, pi. 25, f. 13. MARTENS, Biologia, 

 p. 300. 



"Distinct from the species of Pseudosubulina by the less 

 numerous costce with large interstices, and by the form of 

 the columellar margin which agrees very well with that of 

 S. octona. The only specimen seen (and figured) by Crosse 

 and Fischer is not quite full grown, so that the form of the 

 columella in the adult is not quite certain. 



7. S. STOLLI Martens. PI. 39, figs. 20, 21, 22. 



Shell imperforate, long-turrite, rather thin, sculptured with 

 delicate, close, vertical riblets, rather glossy, whitish, uni- 

 'colored, the apex obtuse. Whorls 11, the first two marked 

 with, some smooth protuberances, the following whorls a trifle 

 convex, with rather deep, somewhat irregular and incrusted 

 suture, last whorl rapidly tapering basally, smooth. Aper- 

 ture oblong-elliptical, the outer margin lightly arcuate, basal 

 margin short, columellar deeply concave, distinctly truncate 

 at the base. Length 24, diam. 5.5, aperture 5 x 3.5 mm. 

 (Marts.). 



Guatemala: Vera Paz (Stoll). 



S. stolli MARTS., Biologia Central! Amer. p. 300, pi. 17, f. 15. 



"General form a little more conical than in 8. octona, 

 from which it is well distinguished by the sculpture. The 

 strong protuberances on the first two whorls are very pecu- 

 liar" (Marts.). 



Genus SYNAPTERPES Pilsbry, 1896. 



Synapterpes PILS., Nautilus x, p. 46, August, 1896, type 

 Bui. lianleyi Pfr. Oxyclieilus Albers, Die Hel., p. 174 

 (1850), not Oxychilus Fitzinger, 1833, nor Oxycheila Dej., 

 1825. Orphnus and Bulimiis sp., auct. 



