148 PROSERPINrDJE. 



The known species may be divided into two sections : — 



A. Provided with palatal plaits (genuine species) § 1. No. 1-2 



B. Destitute of palatal plaits (Odo?itostoma, D'Orb.) § 2. „ 3-6 



§ 1. Palatal plaits distinct. 



1. Proserpina nitida. B.M. 



Shell imperforate, depressed, nearly discoidal, very shining, 

 amber-coloured or fulvous ; spire rather flattened ; whorls six, 

 increasing rapidly, joined by a linear, bordered suture ; last 

 whorl broad, depressed, scarcely convex beneath, with a callous 

 deposit on the centre ; aperture rather triangular, modified by 

 four to five lamellae, the largest of which is placed on the body 

 of the penultimate whorl (sometimes with another smaller and 

 more entering, parallel to the first), one horizontal, slightly 

 twisted on the columella, and two parallel ones on the base . of 

 the last whorl. Height 4, greatest breadth 9, least breadth 8 

 mill. 



Proserpina nitida, Gray, MSS. 



Sow. Conch. Man. ed. 2. p. 237. f. 274. 



Pfr. in Cliemn. ed. nov. Helix, ii. p. 11. 1. 100. f. 12-15; Mon. 

 * Helic. iii. p. 290. n. 2 ; Mon. Auric, p. 170. 



C. B. Adams, Contr. to Conch, no. 3. p. 41. 



H and A. Adams, Gen. rec. Moll. ii. p. 309. pi. 87. f. 10. 

 Helix Proserpina, Pfr. in Zeitschr. f. Malak. 1845, p. 84. 

 Odontostoma nitidum, Pfr. Mon. Helic. i. p. 12. n. 5. 



j3. Much flattened above. 



Proserpina nitida, var. planulata, C. B. Adams, Contr. to Conch. 

 no. 9. p. 174. 



Hah. Jamaica. 



2. Proserpina linguifera. 



Shell imperforate, orbicular, nearly discoidal, slightly convex 

 on both sides, solid, very shining, whitish, yellowish on the 

 middle of the upper side ; suture scarcely conspicuous, covered 

 with callus ; whorls five, increasing regularly, the last obsoletely 

 angulated, somewhat more convex beneath and covered on the 

 centre with a circular deposit ; aperture semiovate, five-plaited ; 

 two unequal plaits on the body of the penultimate whorl, two 

 parallel ones on the basal margin, and one, which is strong and 

 transversely prominent, on the columella; peristome simple, 

 sharp. Height 4|, greatest breadth 8, least breadth 7 mill. 



