28 ANISOSPIRA. 



A. LIEBMANNI (Pfeiffer) . PI. 10, figs. 22-27; pi. 11, figs. 1, 

 2, 3. 



Shell rimate, cylindric-oblong, usually widest above the 

 middle, rapidly contracting above, slowly tapering below; 

 thin but moderately solid; pale brownish-yellow, with an in- 

 distinct reddish line at the suture. Surface very finely, 

 regularly, closely and obliquely rib-striate, the riblets but 

 slightly arcuate. Whorls 7 to 7%, scarcely convex, the last 

 having the base defined by a scarcely noticeable cord. Aper- 

 ture subcircular or rounded oval, oblique. Peristome whit- 

 ish, very narrowly reflexed. Columella straight, somewhat 

 oblique. Internal axis a straight and rather slender pillar, 

 encircled in the last two whorls by a spiral lamella, which 

 makes two spiral turns, is strongest within the penultimate 

 whorl, and is not visible from the aperture. A very weak, 

 more oblique spiral cord encircles the pillar above the lamella, 

 in the last and penultimate whorls. Length 32, diam. 12.7 

 mm. ; length of aperture 8.3, width 7.5 mm. 



Mexico (Liebmann) ; Barrio and Jucliitan, Isthmus of 

 Tehuantepec (Sumichrast). 



Cylindrella liebmanni PFR., Zeitschr. f. Malak., 1846, p. 

 159; Monogr. ii, 370; iii, 564; iv, 691; vi, 359; Conchyl. Cab., 

 p. 4, pi. 1, f. 9, 10; Philippi, Abbild., iii, p. 5, pi. 3, f. 1.- 

 C. leibmanni SOWERBY, Conch. Icon., xx, pi. 13, f. 46. Euca- 

 lodium liebmanni Pfr., FISCH. & CROSSED Moll. Mex. i, p. 390, 

 pi. 15, f. 10, 10 a, &. v. MARTENS, Biol. Centr. Amer., Moll., 

 p. 266. Anisospira liebmanni Pfr., STREBEL, Beitrage Mex. 

 iv, p. 79, pi. 5, f. 12, 12 a, 13; pi. 14, f. 2 A, B. Cylindrella 

 trochee formis SOWERBY, Conch. Icon, xx, pi. 9, f. 80 (young 

 shell). 



This species is thinner, smaller and more finely striate than 

 A. strebeli Pfr., and the internal lamella upon the axis is 

 much stronger than in any other known species. It retains 

 fewer whorls than the more slender A. dalli and A. hyalina. 

 Figures 27 and 1 represent a specimen collected by Sumi- 

 chrast, from the isthmus of Tehuantepec. 



In Pfeiffer's original type, collected by Liebmann (pi. 10, 

 fig. 24; pi. 11, figs. 2, 3), the aperture is oval and a little an- 



