MEXICAN LEPTINARIA. 313 



Costa Rica: Guanacaste, San Jose, valley of the Rio Ter- 

 raba and Golfo Dulce (Pittier). 



27. L. PILICOSTATA (Strebel). PI. 41, figs. 16, 17. 



Shell similar in shape to L. mexicanus, though the whorls 

 are less convex, but differing from all other species by the 

 close, fine, sharp riblets which as usual weaken on the lower 

 half of the whorl. The columellar reflection is rather wide 

 and stands out, leaving an umbilical perforation. The colu- 

 mellar fold is like that of L. modestus, rather weakly devel- 

 oped and inflated rather than lamelliform. 



Length 8, diam. 3, aperture 2.7 x 1.5 mm., whorls 6%. 



Length 7.2, diam. 2.9, aperture 2.7 x 1.4 mm., whorls 6%. 



Guatemala: San Miguel Jucume (probably S. Miguel 

 Turucu in the Polochic valley) (Starek). Honduras: Copan, 

 near the Guatemalan frontier (v. Ihering). 



Lamellaxis filicostatu^ STREBEL, Beitrag Mex., v, p. 113, pi. 

 17, f. 10 (1882). Leptinaria /., MARTS., Biologia, p. 319. 



1 ' Very easily distinguished from all other species by the 

 sculpture. ' ' 



28. L. STREBELIANA n. sp. PI. 42, fig. 25. 



Shell perforate, oblong-turrite, thin, sculptured with very 

 irregularly-spaced, slightly arcuate, thread-like riblets, which 

 become obsolete near the lower suture on the spire and at the 

 periphery of the last whorl. Spire long, the summit very ob- 

 tusely rounded. Whorls 6%> the first 2y^ smooth, moder- 

 ately convex, the rest very convex and separated by deeply 

 impressed sutures. Aperture small, irregularly ovate, the 

 outer lip slightly arched forward, basal margin broadly 

 rounded, hardly receding. Columella vertical, broadly re- 

 flexed, obliquely deeply truncate near the base. Length 8.1, 

 diam. 3, aperture 2.8 mm. 



Nicaragua: Polvon (McNiel). 



Slenderest 'and most Ope&s-like of the Central American 

 species, and further notable for its very convex whorls, sculp- 

 tured with raised, thread-like riblets, which are more crowded 

 than in L. mexicana, and unevenly spaced. It stands close to 

 L. filicostata, but differs by its very convex whorls. No fresh 



