178 AMPHIDROMUS, GROUP VI. 



vi, p. 16 B. perversus var. B. cambodiensis Rv., MORELET. Ser. 



Conch, iv, p. L'60 (1875) A. cambojensis Reeve, FISCHER, Soc. d' 



Hist. Nat. d' Autun, 4me Bull., 1891, p. 114. A. cambojiensis Rve., 

 FULTON, t. c., p. 91, pi. 7, f. 7. 



A very large, solid species, with pure white peristome and parietal 

 callus, and purplish within the mouth. Morelet remarks that of 

 seven specimens, four were dextral and three sinistral ; the smallest 

 one measuring 64 mill. long. According to the same author, the 

 species does not occur in Cambodia. 



I do not remember that it has been noticed that the wood-cut given 

 for Helix cambojiensis in Mouhot's Travels, ii, p. 184, is Camcena 

 illustris. 



A. PLACOSTYLUS Mollendorff. 



Shell dextral, notrimate, ovate-oblong, solid, lightly plicate-striate ; 

 olive-brown, with wide brown streaks. Spire moderately elevated 

 for the genus, swollen-conoid. Whorls 6J, a little convex, impressed 

 below the margined suture, the last wljorl quite convex, about four- 

 sevenths the total alt. of shell. Aperture moderately oblique, ample, 

 subauriform, the peristome rather broadly expanded and reflexecl, 

 thick lipped ; columella nearly straight, forming an obtuse angle with 

 the basal lip, the callus widely appressed. Alt. 70, diam. 41, length 

 of aperture 42, width, with callus, 31, inside 17^ mm. (Mttdff.') 



Phuc-son, Annan t. 



A. placostylus MLLDF., Nachrbl. d. D. Malak. Ges., Oct., 1900, 

 p. 132. 



This fine species, next to A. ingens the largest of the genus, recalls 

 Placostylus in its general form. I know of no other Amphidromus 

 nearly allied to it, but evidently it belongs in the same group as A. 

 ingens. 



There are numerous citations in the literature of the mollusks of 

 Indo- China, of southern, insular species, such as A. perversus, chloris 

 and sultanus, from localities in the Malay Peninsula or Cambodia. 

 It is almost certain that these were based upon species different from 

 those of Java, Celebes, etc.; and probably the specimens would prov* 

 identical with some of the known Cambodian or peninsular species if 

 they could be re-examined in the light (or darkness) of present 

 knowledge. The chief citations of this sort here follow : 



