190 AMPHIDROMUS, GROUP X. 



Alt. 1.2, diam. 0.5 inch (30, 12| mill.). 



Assam : Dihiri Parbat, Dafla Hills, 2000 ft. elev. (Godwin- 

 Austen). 



Bulimvs masoni G.-A., Journ. Asiatic Soc. of Bengal, xlv, 1876, 

 j)t. 2, p. 316. A. masoni FULTON, Ann. Mag. N. H. (6), xvii, p. 

 81, pi. 6, f. 2 Amphidrotnus daflaensis Godwin- Austen, NEYILL, 

 Hand-list Moll. I ml. Mus. i, p. 127 (1878). 



This handsome Bidimus is very similar in form to B. sylheticus 

 Reeve, but this latter shell is smaller, exhibits no trace of spiral stri- 

 ation, has its surface more polished, while the columellar margin and 

 outer lip is pure white ; and in dozens I have collected no trace of a 

 band is ever seen. In color too B. sylheticus differs from the new 

 form in being lemon-yellow with a greenish tinge on the body whorl 

 (G.-A.). 



It is named in honor of Mr. J. Wood Mason. 



A. LKPIDUS (Gould). PI. 63, fig. 99. 



Shell small, usually sinistral, slightly perforate, ovate-conic, ele- 

 vated, polished, citrine. Whorls 6, convex, the last ver.tricose ; 

 suture well impressed. Aperture subcircular ; peristome white, re- 

 flexed, dilated at the columella, the ends approaching. Length of 

 axis seven-eighths, diam. one-half inch (Old.}. 



Mergui Islands (Rev. J. Benjamin). 



Biilinms lepidus GOULD, Proc. Bost. Soc. N. H., vi, p. 12 (Oct., 

 1856) ; Otia Conch, p. 219. PFR., Monogr. vi, p. 33. HANLEY & 

 THEOBALD, Conchologia Indica, p. 34, pi. 80, i'. 6. 



'' A pretty shell, grouping with Icevis, adamsii and mom'liferus, but 

 smaller, proportionally shorter and more ventricose, and differing en- 

 tirely in coloring, texture and the broadly rounded form of the aper- 

 ture " (Gld.). The authors of the Conchologia Indica remark that 

 " except in being shorter, with more rounded whorls, and without a 

 notch at the commencement of the pillar-lip, it might be taken for 

 sylheticus." Fulton considers it a synonym of A. sylheticus ; but as 

 that is a species of the hills and this inhabits a region rather differ- 

 ent faunally, I allow it to stand pending further comparisons of a 

 good series of the Mergui form with Reeve's species. 



A. SINENSIS (Benson). PI. 62, figs. 64, 65. 



Shell sinistral, narrowly umbilicate, ovate-conic, solid, rather 



