VERTIGO. 
171 
umbilicus^ with a longitudinal external rib on the 
outer lip. 
77. 4. Vertigo alpestris. Alpine Whorl Shell. — 
Shell cylindricab pale horn-colour, transparent, 
striolate, with five whorls a little rounded ; 
aperture semicircular, outer lip slightly bent 
and reflected ; teeth four, situated as in V. 
pygmcea, (t. 12. f. 141.) 
Vertigo alpestris. Ferussac^ MSS. ; Alder Mag. Zooh and 
Bot. .ii. 112. — Pupa pjgmaea, var. Forbes and Hanley., 
B.M. iv. 106. t. 130. f. 6. 
Inhab. old walls. 
Differs from V. pygmcea^ to which it is very like, 
in being more cylindrical and slightly striated. The 
teeth somewhat narrow and the colour more fulvous. 
The shell is about one tenth of an inch long, half as 
broad. 
78. 5. Vertigo suhstriata. Six-toothed Whorl 
Shell.— Shell subcylindrical, ventricose, shining, 
striated, yellow horn-colour ; mouth orbicular 
lunate, rather sinuated, with two or three plaits 
on the pillar, and three on the outer lip. (t. 7. 
f. 84.) 
Turbo sexdentatus. Montagu., T. B. t. 12. f. 8. ; Sheppard., 
Linn. Trans, xiv. 156. — Vertigo similis. Ferussac^ Prod. 
64. — Pupa sexdentata. Alder ^ Trans. North., i. 34. - — Pupa 
substriata. Alder., Cat. ii. 339. ; Forbes and Hanley, B. M. 
iv. 108. t. 130. f. 3. — Algea substriata. Jeffreys., Linn. 
Trans, xvi. 315. — Vertigo substriata. Alder, Cat. Supp., 
and Mag. Zool. and Bot. ii. 112.; Gray, Man. 202. — Vertigo 
sexdentata. Turton, Man. ed. 1. 1. 7. f. 84. — Vertigo curta. 
Held. Isis, 1837, 304. 
Inhab. marshy places, at the roots of grass, and 
