190 AMPHIDROMUS, GROUP X. 



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



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

 Austen). 



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

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

 81, pi. 6, f. 2. Amphidromus daflaensis Godwin- Austen, NEVILL, 

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



This handsome Bulimus 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. LEPIDUS (Gould). PL 63, fig. 99. 



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

 vated, polished, citrine. Whorls 6, convex, the last ventricose ; 

 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 (Gld.). 



Mergui Islands (Rev. J. Benjamin). 



Bulimus 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. 



4< A pretty shell, grouping with Icevis, adamsii and moniliferus , 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). PL 62, figs. 64, 65. 



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



