88 AMERICAN SPECIES OF VERTIGO. 



ceeding half the total height of the shell. Aperture sub- 

 rotund, coarctate, 4-toothed : two very minute marginal teeth 

 on the columella; one palatal, short; one strong, marginal in 

 the process of the right margin. Peristome simple, expanded, 

 the margins seperated by the lack of a callus; no apertural 

 tooth. Length 1%, diam. 1 mm. Aperture small (Poey). 



Cuba: Cardenas, on the sandy shore (R. Arango). 



Vertigo neglect a Ar. mss., POEY, Memorias sobre la Historia 

 Natural de la isla de Cuba, ii, 1856, p. 30, pi. 2, f. 17, 18.- 

 PFR., Monographia v, p. 328. 



This has been surmised to be a V. ovata- without the parietal 

 teeth; and as the type was taken on the shore, it may very 

 likely have been a dead shell in which the parietal callus 

 bearing the teeth had scaled off, not an unusual condition 

 in drifted shells. 



4a. Vertigo ovata diaboli n. subsp. PI. 6, figs. 11, 12. 



All of the lamellae and plicae are larger than in V. ovata, 

 entering further; infraparietal lamella developed. Palatal 

 plicae, especially the upper, which converges towards the 

 lower, very strong and long. The entering point of the 

 outer lip is well developed, and the crest behind the lip moder- 

 ately strong, but lower than in typical ovata. 



Length 2.2, diam. 1.25 mm. ; 5 whorls (type). 



Length 2.3, diam. 1.3 mm. 



Texas: drift debris of Devil's River, about 4 miles from the 

 Rio Grande, Val Verde Co. ; collected by Ferriss and Pilsbry, 

 1903. No. 90437 A. N. S. P. 



The specimens are all "dead" shells, but appear to have 

 been lighter-colored than typical V. ovata. The point of the 

 outer lip is seen to project well forward, in a profile view. 

 The impressions behind the lip are about as in V. ovata. 

 Perhaps a distinct species, but as it is known by a single gath- 

 ering, it is left under V. ovata for the present. 



4&. Vertigo ovata mariposa n. subsp. PL 6, figs. 5, 6. 



The shell has the usual broadly ovate shape and auburn or 

 darker color. The teeth are about as in typical V. ovata. 



