86 STROBILOPS, MEXICO, CENTRAL. AMERICA. 



Beitrag Fauna Mex. Land- und Siisswasser-ConchyL, IV, 1880, 

 p. 44, pi. 4, fig. 66. Not II. labyrinthica Say. 



This species stands close to S. hraziliana of Para. It is 

 smaller, with the spire more straightly conic. By the high 

 contour and widely-spaced ribs it differs from other Mexican 

 species. 



Strebel had two specimens of this species, both figured by 

 him, the figures copied photographically on my PI. 4, fig. 6, 

 and both are drawn in PI. 9, figs. 1-3. These specimens are 

 No. 14581 of the Strebel collection in the Zoologisches Institut 

 und Zoologisches Museum, Hamburg. 



Strebel suspected that this form might be worthy of varietal 

 separation from S. labyrinthica, in which species he included 

 8. streheli, but it certainly differs widely from both. No com- 

 parative study of the different Strobilops forms had been made 

 at the time he wrote. ^S^. veracruzensis belongs to the strebeli 

 group, by the arrangement of internal folds, but it differs 

 strongly by the high contour and the widely-spaced ribs. 



6a. Strobilops veracruzensis crossei, n. subsp. PI. 9, figs. 4, 4a. 



The shell is narrowly umbilicate, conoidal, quite thin, with 

 well-spaced, slightly oblique riblets; pale brown. Spire con- 

 vexly conic, the apex rather obtuse ; suture impressed. Whorls 

 5%, very weakly convex and slowly increasing, the last whorl 

 not descending, obtusely subcarinate peripherally, and be- 

 coming nearly smooth below the carina and over all the basal 

 surface. The aperture is oblique, auriform, colored like the 

 rest of the shell, provided with and narrowed by two slightly 

 diverging parietal lamellge, of which the first is noticeably 

 stronger and more projecting, while the other, nearer the 

 columella, is less developed. Peristome simple, the margins 

 united by a tliin callous deposit, columellar margin slightly 

 reflected, the basal and outer margins weakly thickened, 

 upper margin straight. Height 2.25, greater diameter 2.5, 

 lesser 2.25 mm. {Fischer and Crosse). 



Mexico: Plantation "Mirador," near Soledad, in the State 

 of Vera Cruz (Dr. Bereudt). 



Helix strebeli Fischer and Crosse, Miss. Sci. au Mexique, 



