HELIOIDJE. 



88. Plectopylis oglei, Godwin-Austen. 



Helix (Plectopylis} oglei, Godwin-Austen, J. A. S. B. xlviii, 1879, 



p. 3, pi. 1, fig. 2 (shell and parietal armature). 

 Helix (Atopa (Plectopylis)} oglei, Tryon, Man. Conch, ser. 2, iii, 



1887, p. 159, pi. 36, figs. 29-31. 

 Plectopylis oglei, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 146; Glide, 



Science Gossip, N. s. iv, 1898, p. 263, fig. 68 (shell and armature). 

 Plectopylis (Chersaecia) oglei, Gude, op. cit. vi, 1899, p. 148. 



Original description : " Shell dextral, widely umbilicated, sub- 

 discoid, dull pale brown with close- set sienna markings crossing the 

 whorls. Epidermis thick and nacreous, and somewhat rough. 

 Apex flat but slightly concave, the whorls rising regularly. 

 TVhorls 8, the last descends slightly near the aperture, which is 

 very oblique and ovate. Peristome slightly reflected, white, con- 

 tinuous on the body-whorl, but not strongly developed. Palatal 



Fig. 39. Plectopylis oglei. 



teeth 6, 3rd, 4th, and 5th equal, 6th longer, double. On the 

 parietal side is one single vertical lamina with buttress-like sup- 

 ports on posterior side above and below." (Godwin- Austen). ~ 



Major diam. 27, minor 25 mm. ; alt. 8 mm. 



Hob. Assam : Sadiya (Ogle}. 



The parietal armature consists of a single strong vertical plate, 

 which gives off posteriorly two short ridges, one at the upper and 

 one at the lower extremity (see fig. 39 d, which gives an enlarged 

 view of a specimen with the outer wall removed). The palatal 

 armature consists of six horizontal folds : the first, near the 

 suture, very short and thin ; the second, third, fourth, fifth, and 



