144 helicidjE. 



Trans, xiii. 843.; Forbes and Havley, B. Moll. Iv. 81. t. 121. 

 f. 7, 8.— Helix rupestris. Drop. Mull. Franc, p. 82. t. 7. 

 f . 7 — 9.; Turton, Man. ed. 1. 60. f. 4.5.; Bossm. Icon. y'm. 

 f. 534. — Zonites rupestris. Leach, Moll, Syn. 74. — Turb' 

 myrmecidis. Scacchl., Oss. Zoul. i. 11. — Zonites umbilica- 

 tus. Gray. Man. 166. f. 5. t. 45. — Pyramidula rupestris. 

 Fitz. Syst. 95. — Patula rupestris. Held. Ms, 1837, 916.— 

 Euryoniphala rupestris, and E. umbilicata. Beck, hid. 9. — 

 Delomphalus rupestris, and D. saxatilis. Hartm. i. 120. 

 t. 37. f. 1—6. — Helix spirula. Villa Desp. Syst. 56.— 

 Helix aliena. Ziegler, in Pfeif. Symb. i. 39. 



On elevated rocks, and under the top stones of 

 walls and lofty buildings, always in dry places, on 

 calcareous soils. 



Animal black-grey, polished ; upper tentacles 

 cylindrical ; jaw narrow, regularly striated in front, 

 and minutely crenulated on the edge. {3foq. Tand. 

 t. 15. f. 10.) 



Shell the tenth of an inch in diameter, elevated 

 on the upper side, with five rounded and deeply 

 divided volutions, slightly striate, of an uniform deep 

 opaque chocolate-brown ; aperture nearly circular, 

 being very little interrupted by the penultimate 

 volution, the margin thin and not reflected ; umbilicus 

 funnel-shaped. 



This shell varies in the elevation and depression 

 of the spire. 



Montao;u observes it is remarkable that " this 

 shell always aifects such lofty places as the tops of 

 houses, without one being found near the base ; and 

 in that situation its inhabitant braves equally the 

 scorching beams of the sun in summer and the frigid 

 wind of winter, without attempting to descend." 

 ( Test. Brit. 435.) 



Colonel Montagu's name should be retained for 



