98 VERTIGO. 



island form in order to stimulate the attention of future 

 collectors. It was found associated with V. c. catalinaria. 



Vertigo degeneris Pilsbry. PI. 15, fig. 9. 



The oblong, brown shell tapers from the last whorl to the 

 obtuse apex. The whorls are strongly convex, almost smooth, 

 but on the penult whorl some spaced wrinkles along growth 

 lines are noticeable; though weak, they evidently correspond 

 to the riblets of V. calif ornica. The rounded aperture has no 

 teeth. Columella concave, the columellar lip being rather 

 broadly expanded. Length 1.9 mm., diam. 1.1 mm., 41/2 

 whorls. 



Guadalupe Island, Lower California: collected about 1000 

 feet above the landing at Northeast Anchorage by G. D. 

 Hanna. 



Vertigo degeneris Pils., Proc. Cal. Acad. Sci. (4) XVI, 

 1927, p. 175, pi. 7, fig. 6. 



A strongly characterized form, which, however, may prove 

 to be connected with a similarly toothless form found at North- 

 east Anchorage in which the riblets are well developed, length 

 1.8 mm., diam. 1.1 mm. As only broken examples of this 

 ribbed form were taken, its status is left in suspense for the 

 present. 



Vertigo torrei Aguayo & Jaume. PL 24, fig. 1. 



The shell is rimate, very small, ovate-conic, corneous, trans- 

 lucent, with a waxy luster, finely striate axially, the striation 

 more distinct on early whorls and obsolete on the last. Suture 

 deej). Whorls 4iA, convex, the last well rounded ; apex obtuse. 

 Aperture transverse, semicircular, provided with seven ivory 

 white teeth in all specimens examined, as follows: a small 

 angular lamella ; a high and thick parietal lamella, about twice 

 as large as the angular and slightly oblique ; a large columellar 

 lamella which is slightly curved toward the apex of the shell ; 

 a basal lamella, well developed but more compressed, and 

 three-fourths the length of the preceding ; a lower-palatal fold, 

 high, deep, and curving towards the columella; an upper- 

 palatal fold, parallel to the preceding and of about the same 



