140 pulmonata. 



183. Nanina securiformis. 



Shell orbiculate-subglobose, thin, lucid, greenish, smooth, 

 sharply angulate at the periphery ; spire broad, conoidal, with 

 the apex acuminate ; whorls four and a half, moderately convex, 

 rapidly increasing, the last one large, ventricose, convex and sub- 

 perforate beneath ; aperture rounded-triangular, large ; peristome 

 simple, thin, not reflected. Height 6, breadth 10 mill. {Desk.) 



Helix securiformis, Desh.inFer. Hist. i.362.n. 428. t. 64 A. f. 5,6. 

 Pfr. Mon. Suppl. 57. 



Locality unknown. 



184. Nanina zonites. 



Shell umbilicated, depressed, thin, diaphanous, closely costu- 

 late-striated, yellowish-horny ; spire scarcely elate ; whorls six, 

 slightly convex, regularly increasing, the last ornamented with a 

 rufous line above the middle, conspicuous even to the apex, base 

 smoother, subplanulate ; umbilicus moderate, pervious ; aperture 

 depressed, obliquely lunate-oval, iridescent inside; peristome 

 simple, straight, columellar margin si^reading a Httle. Lat. maj. 

 25, min. 20, alt. 12^ mill. 



Helix zonites, Pfr. Proc. Zool. Soc.1845, p. 127 ; Mon. Helic. i. 99. 



Reeve, n. 615. t. 109. 

 Hab. ? 



185. Nanina semipartita. 



Shell perforate, orbicularly discoidal, rather convex above and 

 beneath, white, pale yellowish, with a narrow browTi band at the 

 periphery ; spu-e very short, blunt ; whorls five, rather flattened, 

 striate and decussated above, last whorl depressed, convex at its 

 periphery ; umbilicus very narrow, deep ; aperture oblique, ovate- 

 semUunar, rather transverse ; peristome simple, blunt, with the 

 basal margin dilated. Height 15, breadth 26 mill. {Desk.) 



Helix semipartita, Desk, in Per. Hist. i. 187. n. 241. t. 89. f. 5. 

 Pfr. Mon. Suppl. 71. 



Locality unknown. 



186. Nanina induta. 



Shell perforated, lenticular, acutely keeled, sohd, closely plaited- 

 striate above, decussated with close, concentric lines, striated be- 

 neath, chestnut, paler beneath, with a chestnut areola roimd the 

 perforation, clothed entirely with a very thin horny-grey epider- 

 mis; whorls five, plane, increasing gradually; aperture sub- 

 rhombic ; jieristome simple, columellar mai-gin very slightly re- 

 flected. Lat. maj. 21, min. 18, alt. 11 mill. 



