392 Journal of the Asiatic Society of Bengal. |N.S., XIX, 
form of a triangular projection, but so gradually that it is 
difficult to say exactly on what tooth it first appears. As the 
series precedes outwards on both sides the main cusp becomes 
narrower and sharper and the lateral cusp more prominent. 
After about 12 teeth the latter becomes minute and continues 
in this condition to the i of the radula. There are about 
80 teeth in a transverse ro 
Type-specimen in the % S.I. (Indian Museum), M ‘231°. 
Paratypes in the British Museum. 
he species is probably related to B. heudeanus Ancey! 
from the province of Szechuan, but the shell is much broader 
and has one whorl less and the lip is still narrower. In this 
last character, however, it does not conform to Méllendorifi’s 
definition of the subgenus Petracomastus, of which B. heudeanus 
is the type and from which it also differs in the absence of the 
peristomal tubercle. 
15. Buliminus (Petraeomastus) latilabrum, sp. nov. 
(Plate 16, Figs. 5, 5a). 
A good series of ae with dried animals in them was obtained 
on the upper Yangtze west of Pung-tsu-la (altitude about 9,500 feet) 
n July in very arid éontiitione also a seed shell at egg (altitude. 
9 600) 5 in the same district on a tributary of t 
The shell is of large size, but tise sie ‘egies whorled 
dextral, subcylindrical and tapering towards the apex from the 
sixth whort upwards, The apex is very minutely mucronate. 
The whorls increase in depth evenly and progressively, more 
rapidly i in the upper part of the shell than below. ‘The iwaaeh 
is about twice as deep as the sixth, but the body-whorl is not 
as deep as these two together. The protoconch passes 
gradually into the younger whorls, The suture is linear and 
slightly impressed; the whorls are slightly convex. The 
mouth abruptly. The umbilicus is very narrowly rimate and 
hardly perforate The mouth is — and oval, oblique, and 
almost membraneous annular saad Which is more or less 
ecimens examined. The surface of the 
shell has a dull lustre. The. sculpture consists of fine, irre- 
gular curved longitudinal striae and sometimes of obscure 

i se wn thibetanus, Heude ome Pfeirfer), op. cit., Plato XVI 
ie 
Fig.9. B.(Napa i}ber, in Bela Szecheny’s Wiss. Ergebn 
Rave; IT, p. 603, Plate IIl, Fi igs. 5 5,6 


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