344 CYCLOtHORlD^, 



transverse costulae : suture well impressed ; columella margin 

 vertically descending, bearing a strong, downwardly bent, entering 

 lamella above, sharply angled at the base, diffused above into a 

 thick, outwardly expanded, well defined, parietal callus which 

 joins the upper margin of the labrum and gives to it a continuous 

 appearance ; labrum consisting of an outwardly expanded and 

 slightly refiexed, shelf-like projection from wliich springs an erect, 

 rather thick rim ; aperture subcircular. 



" Alt. 4*5, diam. maj. 2-5 mm. Aperture alt. l*2o, diam. 1*5 

 (nearly) mm." (Preston.) 



Hah. India : Upper Eotung, 2000 ft. {Kcmj), Oakes). 



531. Diplommatina tliomsoni, Oodwin- Austen. 



Diplommatina thomsoni, Godwiu-Austen, Proc. Zool. Soc. 1892, 



p. 514 ; id., Land & Freshw. Moll. India, ii, 1897, p. 9, pi. 65, 



tigs. 2, 2 «. 

 Diplommatina {Metadiancta) thomsoni, Kobelt & MiJllendorff, 



Nachr. Dents. Malak. Ges. xxx, 1898, p. 139; id., Cat. Pueum. 



1899, p. 59 ; Kobelt, Das Tierreich, Lief. 16, 1902, p. 451. 



Original description'. — "Shell dextral, elongately fusiform; 

 sculpture, 3 apical whorls smooth, all the I'est witli very tine 

 regular, rather close ribbing ; colour w^hitish ; spire rather high, 

 sides flattened; apex rather blunt; suture moderately impressed; 

 whorls 7i, sides convex, the antepenultimate the largest, last 

 whorl ascending near the aperture ; constriction lies directly 

 behind aijd adjacent to the peristome ; aperture oval ; columellar 

 tooth small for size of shell and lying within the aperture ; 

 peristome as usual. 



'' Major diam. 2*4; alt. axis 5 millim." 



Hah. Burma : South Burrail {Godwin- Austen). 



" In general form this shell is like D. padnjcheilas, Bs., a Dar- 

 jiling species, but the columellar tooth is never so large as in that 

 species." (God.win- Austen.) 



Subgenus SINICA, Mollendorff. 



Sinica, Mollendorff, Jalnb. Deuts. Malak. Ges. xii, 1885, p. 369 

 (section) ; Kobelt & Mollendorff, Nachr. Dents. Malak. Ges. xxx, 

 1898, p. 139 (subo-enns) : id., Cat. Pneuni. 1899, p. 59 ; Kobelt, 

 Das Tierreich, Lief. 16, 1902, p. 455. 



Type (1st species), D. coUarifera, Schmacker & Boettger 

 (D. lahiosa, Martens non Blanford). 



Range. India, Burma, Farther India, C'liina, Japan, Formosa, 

 Malay Archipelago, New Guinea. 



Shell generally dextral, last whorl constricted at its commence- 

 ment, a tooth on the columellar margin, another on the penultimate 

 whorl and facing the latter a palatal fold, visible from outside. 



