MOLLUSCA OF INDIA. 145 
Dur@eELia KHAsIACA, n. sp. (Plate XX XIX. figs. 7, 7a, 75.) 
Locality. West Khasi Hills (7, H. G.-A.). 
The shell has been drawn four times the natural size, to bring 
it to the size of A. salia (see on Plate XXXVII.), to better illustrate 
the slight difference in form of these shells. 
Shell depressedly ovate, thin, horny, shiny, smooth, with close, 
fine, transverse lines of growth ; colour pale ochraceous olive ; spire 
very depressed, flatly convex ; suture shallow; whorls 3, rapidly 
increasing; aperture oblique, flatly ovate ; columellar margin but 
weakly developed. 
Size: major diam. 6-7, minor diam. 5:0, alt. axis 2°0 mm. 
e 0:26, s 0:20; 55. 0:08 sneh. 
Odontophore. Jaw thin and horny, nearly straight in front. The 
radula (figs. 8, 8 a, 86) is a beautiful object in the microscope. 
225 .1 . 225 
in 120 rows, or 54,000 teeth; the central is elongate, with three 
equal-sized points ; the lateral teeth are all alike, much curved and 
bicuspid, the outer point slightly in excess of the inner, gradually 
decreasing in size outwards.- 
The right shell-lobe is triangular and extends over the right side 
of the shell; the left is reflected over the peristome for some dis- 
tance and then gives off a long lingual process. Extremity of foot 
very long and narrow. 
We at present know 
D., levicula, Bs. Tenasserim. 
D. assamica, G.-A. Tezpur, Assam. 
D. minuta, G.-A. Dafla Hills. 
D. khasiaca, G.-A. West Khasi Hills. 
D. christiane, Theob. Andaman Islands. 
D. mairangensis, G.-A. Khasi Hills. 
This last will be described in a future part, with descriptions of the 
others, 
Srraza (continued from p. 76). 
The odontophore of Sitala crenicincta (described in Part II. p. 75, 
Plate XIII. fig. 2) is very similar in every way to that of Kalella 
barrakporensis (Plate V. fig. 11), but the outer laterals are not tri- 
cuspid. The central tooth is very large (Plate XX XVIII. figs. 4, 4a), 
tricuspid, the central point broad and long; the median teeth are 
bicuspid, with the outer denticle near the base, while in the outer- 
most three or four it nearly disappears. There are very few in the 
row, as follows :— 
ISite 200s Selo. LS'to 20 
or lest 25: 
02 
