

1GO AMPHIDROMUS, GROUP VI. 



I) 1 . Shell yellow above, green below ; spire pyramidal ; lip 

 thick, completely ailnate and black- bordered behind. 



dohrni, p. 173. 



4 3 . Shell clouded, streaked or banded with reddish or green 

 on a yellow ground ; stoutly ovate. comes, p. 170. 



I 4 . Shell copiously streaked with brown. 



c. Base abruptly darker than upper surface. 



inversus, p. 167. 



c. Base not abruptly darker, often pale below the 

 sutures. 



d. large and solid, clouded, length 64-70 mm. 



cambojiensu, p. 177. 

 rf. 1 Length 40-60 mm.; streaked. 



aureus, p. 160. 

 b. 5 Shell with three broad spiral bands. metabletus, p. 174. 



A. AUREUS (Martyn). PI. 54, figs. 70, 71, 72. 



Shell either sinistral or dextral, long-ovate, solid, smoothish, yel- 

 low, with a broad white zone below the sutures, and typically having 

 numerous narrow, reddish-brown, undulating stripes upon the median 

 <md basal parts, but not extending over the white zone; usually with a 

 single varix upon the penultimate or front of the last whorl ; spire 

 whitish, the apex typically white, but black in some yarn-ties. 

 Peristome reflexed and recurved, white, not brown-edged; parietal 

 callus white. 



Alt. 58-60, diam. 29-31 mill., or somwhat smaller. 



Prince Island, in Sunda Strait, off the N.-W. extreme of Java, on 

 the upper branches of high trees (Sir Joseph Banks). 



Lirnax aureus MARTYN, Universal Conchology, iii, pi. 115 (and 

 Chenu's reprint, Bibliotl.eque Conchyliologique, ii, p. 28, pi. 39, 

 t. -2). Chersina J'ulva and 0. perversa (in part), Prince's Island, 

 HUMPHREY, Museum Calonnianum, p. 63, no. 1163, 1164 (1797). 



Helix perrersa DONOVAN, Naturalist's Repository, or Monthly 



Miscellany of Exotic Nat. Hist., ii, pi. 49, f. * * typical, and f. * 



color- var. (1824) Not Helix, Hulimus or Amphidiomus aureus of 



Dillwyn, Ferussac, Swainson et al. 



This hitherto misunderstood form is one of those brought to 

 Europe by the heroic South Sea explorers of the eighteenth century. 

 It was collected by Sir Joseph Banks, who accompanied Cook on 



