240 HELIX-OBBA. 



H. platyodon PFR. P. Z. S. 1845; Mon. Hel. Viv. i, p. 311 ; 

 Conchyl. Cab., t. 63, f. 11, 12. PHILIPPI, Abbild., ii, Helix t. 7, f. 

 1. MARTENS Ostas. Landschn., p. 50. GREDLER, Mai. Bl. n. f. v, 

 p. 175 MOLLENDORFF, Jahrb. D. M. Ges. 1884, p. 372, t. 8, f. 3- 

 8. H. tournoueri CROSSE, Journ. de Conchyl. xvi, 1868, p. 107, 

 173, t. 6, f. 4. 



In both form and coloration this species varies much. The gen- 

 eral pattern of banding, the granulated surface and general form 

 are, nevertheless, sufficiently different from any other species to per- 

 mit ready identification. Fig. 36 of plate 32, represents the typical 

 form. The columellar tooth is often more prominent and square 

 than the figures show. 



The jaw, Mollendorff says, is of the odontogriathous type. Ani- 

 mal finely wrinkled, pale reddish gray-brown ; sole yellowish gray- 

 brown, indistinctly tripartite. 



H. MORLETI Dautzenberg & d'Hamonville. PI. 65, figs. 80, 81. 



Shell umbilicated, conic-globose, thin, subpellucid, very shining. 

 Spire conoid. Whorls 7, convex, densely radiately arcuately pli- 

 cated ; the base delicately striated, perforated by a very deep, fun- 

 nel-shaped umbilicus. Aperture subrotund, margins thickened, 

 broadly reflexed, joined by a thin, shining callus. Columella sub- 

 dentate at base. Color pale grayish buff. Alt. 23, greater diam. 

 30, lesser 25 mill. (D. & d'H.) 



Road from Bac-Ninh to Lang-Son, Tonquin. 



Helix Morleti D. & H., Journ de Conchyl. 1887, p. 217, t. 8, 

 f. 3. Rhagada Morleti ANCEY, Le Naturaliste, (Paris), p. 70, March, 

 1888. Helix mercatorina MABILLE, Bull. Soc. Mai. France, 1887, 

 p. 88, t. 2, f. 10, 11. 



This species seems more closely allied to H. platyodon than to 

 other forms known to me. A translation of the original descrip- 

 tion of H. mercatorina was given in this volume, p. 121, and the 

 original figures are on pi. 15, figs. 67, 68. I have no doubt that the 

 species really belongs to Obba rather than in Euhadra where I form- 

 erly placed it. 



H. morleti is apparently allied to H. merarcha in having numerous 

 narrow whorls of the spire. 



