PULMONATA, 147 



basal margins imperceptibly thickened, columellar margin shortly 

 reflected. Height 13, greatest breadth 43, least breadth 35 mill. 

 (Bens.) 



Helix Cysis, Benson in Ann. ^- Mag. N. H. 2nd ser. ix. 1852, 404. 



Pfr. Mon. Suppl 92. 

 Helix Cystis, Reeve, Conch. Icon. n. 737. t. 123. 

 Hab. Neilgherries, South India (Jerdon). 



12*. ORPIELLA. 



" Animal with the usual anal lappel of Nanina covering the 

 mucous pore, and six other smaller ones between this and the 

 shell arranged in a double series along the back of the tail. 



" Shell somewhat Hke Cyclostoma tigrinus." — Gould. 



1. Orpiella Scorpio. 



Shell chestnut-red, tessellated with piuiilish -black radiating 

 lines ; spire depressed beneath, scarcely convex ; whorls four and 

 a half, convex. 



Helix (Nanina) Scorpio, Gould, Exped. Shells, 24. 1846; Proc. 



Boston Soc. 1846, 178 ; Exped. Shells. 1851, 33. f. 87. 

 HeUx Scorpio, Pfeiffer, Mon. Helic. i. 431 ; iii. 272. n. 1632. 

 Hab. Feejee Islands. 



13. ZONITES. 



Shell broadly umbihcated, orbiculate, convex or discoidal, 

 striated or decussated beneath, smooth, shining ; whorls six or 

 seven, gradually increasing in size ; mouth oblique, limate ; 

 peristome straight, acute, and slightly thickened internally. 



" The animal [Helix algira) with the orifices for the generative 

 organs on the neck, nearer the edge of the mantle than the head ; 

 the lobes of the collar not larger than in other Helices, and some- 

 times edge the shell ; the lips or buccal tentacles are very con- 

 tractile and placed entire beneath the mouth, extending late- 

 rally so as to be rather w ider than the foot. If the mucous pore 

 does not exist in this species as in the Arions, a well-marked slit 

 is to be observed in its place, to which the grooves on the upper 

 part of the foot tend." — Ferussac, Tab. Syst. 10. 



According to M. Morelet the subcaudal gland of Z. euryom- 

 phala is large and distinct, and the foot broad, dilated, and de- 

 pressed behind. 



h2 



