128 



HELICID.E. 



110. Plectopylis'feddeni, Blanford. 



Helix (Plectopylis) feddeni, Blanford, J. A. S. B. xxxiv, ] 865, p. 75 ; 



Godwin-Austen, P. Z. S. 1874, p. 611, pi. 74, fig. 7 (parietal 



armature) ; Nevill, Hand List, i, 1878, p. 71 ; Tapparone Canefri, 



Ann. Mus. Civ. Geneva, ser. 2, vii, 1889, p. 47. 

 Helix feddeni, Hanley & Theobald, Conch. Ind. 1875, pi. 131, 



figs. 1-3. 

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



1887, p. 163, pi. 35, figs. 84-87. 

 Plectopylis feddeni, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 145 ; 



Gude, Science Gossip, N. s. iv, 1897, p. 171, fig. 64 ; vi, 1899, 



p. 76, fig. 104. 

 Plectopylis '(s. s.) feddeni, Gude, op. cit. vi, 1899, p. 148. 



Original description : "Shell sinistrorse, very widely urn bilicated, 

 discoid, flat above, thin, dull white, marked by rather irregular 

 oblique sculpture both above and below. Spire quite flat, apex 

 not rising above the surface, suture impressed. Whorls '6|-7, 

 narrow and closely wound, slightly convex above ; the last much 

 broader, rounded at the periphery and beneath, descending 





Fig. 63. Plectopylis feddeni. 



abruptly close to the mouth. Umbilicus shallow, exposing all 

 the whorls. Aperture more nearly horizontal than vertical, 

 subcirculariy lunate. Peristome slightly thickened, expanded 

 throughout, margins joined by a rib, from the centre of which 

 a lamina sometimes runs up to the parietal plication, but is 

 frequently interrupted a short distance within the aperture, and 

 is always thicker and higher near the mouth than farther back. 

 Parietal plication consisting of a vertical lamina in front, and a 

 second, slightly oblique, just behind ; the first giving out the 

 interrupted lamina running to the aperture from the top, and a 



