STAFFOBDIA. DYAKIA. 299 



has no notch. All the laterals are shortish aculeate teeth, becoming 

 very small on the margin. 



The jaw is large, solid, convex on the edge, and rather straight 

 in the centre as opposed to the usual central projection.] 



[467. Staffordia daflaensis, var., Godwin-Austen, Mol Ind. ii, 1907, 

 p. 185, pi. 113, fig. 2 (shell). 



Original description : Shell : sculpture coarse longitudinal 

 ribbing, rather irregular ; colour ochraceous olive-green. 



Size: maj. diam. 16'4, min. 14-8; alt. axis 8-0, alt. b.-w. 6*5 mm.] 



[468. Staffordia toruputuensis, Godwin-Austen, Mol. Ind. ii, 1907, 

 p. 185, pi. 113, fig. 3 (shell). 



Original description-. Shell not fully grown; sculpture very- 

 smooth, with a thick shining epidermis with indistinct striation ; 

 colour light ochraceous olive-green. 



Size : maj. diam. 16'5, min. 14-0; alt. axis 7'25 mm. 



Hub. Toruputu Peak, Dafla Hills.] 



[469. Staffordia Stafford!, Godwin- Austen, Mol. Ind. i, 1883, pi. 21, 

 fig. 14 (sculpture) j id. t. c. ii, 1907, p. 185, pi. 113, fig. 4 (shell). 



Original description : Shell : umbilicus almost hidden, mode- 

 rately solid, with a thick epidermis, very globosely conoid, rounded 

 below ; sculpture small, elongate papillsD arranged longitudinally, 

 and differing from all the other species collected in the Dafla 

 Hills ; colour olivaceous ochre ; spire low ; suture shallow ; whorls 

 5, sides convex above, rather flattened on the periphery of the 

 last whorl ; aperture lunate, narrow, subvertical, milky white 

 within, rounded below; peristome thin, slightly sinuate below, and 

 nearly vertical near the columella. 



Size: maj. diam. 15'2, min. 13'2; alt. axis 7*8, alt. b.-w. 6-0 mm. 



Hob. Toruputu Peak, Dafla Hills, 7000 ft. 



The shell is not adult, but the sculpture is so peculiar I have 

 been obliged to designate the species, which I have named after 

 the Brigadier-General who commanded the Expedition.] 



Genus DYAKIA. 



Dyakia, Godioin-Austen, P. Z. 8. 1891, p. 29, pi. 5, figs. 4-4 c, 6-5 b 



(generative organs). 

 Semperia, Godwin-Austen, Mol. Ind. ii, 1898, p. 82. 



Type, D. hugonis, Pfr., from Borneo. 



Range. From Tenasserim throughout the greater part of .the 

 Malay Archipelago. 



This genus is chiefly distinguished from Ariophanta by the 

 characters of the radula, and especially by having bicuspid 



