134 PULMONATA. 



16G. Naxixa ornatella. 



Shell imperforate, orbiculate-convex, thin, keeled, smooth, 

 very shining, pellucid, pale or darker yellow or fulvous, imiform 

 or marked with a single reddish-bro^Ti band, rarely purple-red 

 beneath ; spire obtusel}" conoidal ; whorls four and a half, mo- 

 derately convex, the last keeled, more convex beneath ; apeiture 

 httle obhque, lunate, slightly angular ; peristome simple, sharp, 

 straight, with the columellar margin somewhat callous, entering. 

 Height 7, greatest breadth 11^, least breadth \0i mill. {Pfr.) 



Microcystis ornatella. Beck, Indejc, 2. n. 4. 



Nanina (Microcvstisj ornatella. Beck in M. R. C. viii. t. 3. 

 f. a-h. 



Alb. Helic. 59. 

 Helix ornatella, Pfr. Symb. ii. 36; Mon. i. 32 (part.); Suppl. 

 38; Ic. n. 815.t. 129. f. 7-10. 

 Reere,t. 107. f. 596 b. 

 Helix realis, Miihlf. in Anton, Verz. 35. n. 1329. 



3. ? ^lore depressed, uniformly greenish-yellow. 



Microcystis amcenula. Beck, Ind. 2. n. 6. 



Nanina (Microcvstisj amcenida, Beck in M. R. C. \-iii. t. 3. 



f. 5 a-d. 

 Hab. Pitcairn Islands (H. Cuming) and Opara? 



This species, which has often been confounded with JV. Adamsi, 

 Pfr., may be distinguished fi-om that shell by the number of 

 its whorls, the last of which is keeled to the peristome, by its 

 pellucidity and the more convex base. 



167. Nanixa orbis. 



Shell imperforate, discoidal, greenish-yellow, ver\- glabrous, 

 bright, pellucid, smooth above, slightly convex beneath, impressed 

 in the middle ; suture slightly margined ; whorls live to six, 

 level, the last but one rather wider, angulated above ; aperture 

 nearly vertical, \\'ide, lunar; peristome straight, acute, simple. 

 Lat. maj. 9^, min. 8f, alt. 3^. 



Helicopsis orbis. Beck, Ind. 2 (Anton). 



Helix orbis, Pfr. Symb. ii. 35; Mon. Helic. i. 32; Ic. i. 234. 



Reeve, n. 623. t. 10. 



Cfiemn. ed. 2, Helix, n. 206. t. 30. f. 8-10. 

 Helix plauulata, Anton, Verz. p. 35. n. 1326 (not Lam.). 

 Nanina (Microcystis) orbis. Alb. 59. 

 Hab. Opara. 



