144 LAND AND FRESHWATER 
Sitala and Durgella are intimately connected by this characteristic 
dentition. 
Dureetta minvta, Godwin-Austen. (Plate XXXIX. figs. 1-6.) 
Helicarion minutus, Godw.-Aust. J. A.S. B. 1876, p. 318, pl. viii. 
figs. 1, la, 1b. 
Locality. Under Toruputu Peak, Dafla Hills (H. H. G.-A.). 
Amended description. Shell depressedly ovate, horny, rather solid, 
with a glazed polished surface ; colour brown, with an olive tinge, 
olive-green by transmitted light; spire rounded; suture deep ; 
whorls 23, very rapidly increasing; aperture oblique, laterally 
ovate ; peristome thin ; columellar margin not thickened, oblique. 
Size: major diam. 6°7, minor diam. 4°8, alt. axis 2-7 mm. 
re 0°26, 4 Ord 9,- tags Or. inchs 
Animal (Plate XX XIX. figs. 2, 2a), dried specimen after soak- 
ing. Head black; foot well mottled with black, the pedal line is 
indicated by a double line of short oblong black streaks, with lateral 
spots above lying between the lateral grooves; the pedal margin 
pale. The central area of the foot beneath is for the entire length 
black, a very distinctive character in this species. The right shell- 
lobe (fig. 2) is ample, and the left (fig. 3) extends from the respira- 
tory orifice, and is reflected over the shell; a tongue-like process on 
the left posterior margin, very narrow behind where it meets the 
right shell-lobe. The right dorsal lobe is of normal form and the 
left is narrow and continuous, saving a small slit on the left 
margin. 
Odontophore. The radula (figs. 5, 5a) is very beautiful and cha- 
racteristic of the genus, with one straight central tooth, succeeded 
by equilateral bicuspid teeth, all much curved inwards, and similar, 
very numerous, and very gradually decreasing in size to the outer 
margin of the lingual ribbon. 
190°, 1°. 196 
Jaw (fig. 4) slightly arched and no central projection. 
It will be noticed at once how the radula of this species differs 
from that of D. khasiaca from the West Khasi Hills, alluded to on 
p. 313 of my paper “On the Helicidz collected during the Expe- 
dition into the Dafla Hills, Assam,” which I at first, in 1876, con- 
sidered a variety of D. minuta, but on closer examination even the 
shell and animal are distinct in form and markings. 
Living animal (Plate XX XIX. fig. 1). Pale horny ; tentacles and 
a line from them to the mantle dark coloured, with a dark line 
down the upper surface of the extremity of the foot, which last is 
mottled on the side. The mantle just covers the edge of the shell, 
and the right shell-lobe is moderately developed. The portion of 
the body anterior to the shell is very short in comparison with the 
posterior portion. Total length 17°3 mm.=0:7 inch; head to 
mantle 2°5mm.; mantle to extremity of foot 10°7mm. A well- 
marked hooked process above the mucous gland (fig. 1 @). 
