1923.] Zoological Results of Expedition to Yunnan. 393 
malleations, which are, as a rule, confined to the basal and 
penultimate whorls. The protoconch is dull chestnut. This 
colour passes into an obscure iiliaceous or vinous tint on the 
other whorls. Irregular vertical vinous or brownish striae are 
sometimes present. The lip is pure white, while the internal 
surface is tinged with brown. One specimen (from Shahi) is of 
an almost uniform pale, vellowish colour. 
The radula. The teeth are shorter than in B. chrysalis 
but broader and the central is distinctly shorter than the 
inner laterals. The upper margin of the cusp is irregularly 
trilobed. The transition from laterals to marginals (counting 
the latter from the point at which the lateral cusp appears) 
is more abrupt and the main cusp of the marginals is 
more expanded and blunter, while the outer cusp is more 
prominent and gradually assumes a pectinate character with 
from three to five small sharp denticulations. Sometimes the 
main cusp, which persists distinct, is broadly bilobed, but this 
appears to be an abnormality. The formula is 24:1]1'1-11 24, 
Ty pe-specimen in the Z.S.J. (Indian Museum), M 32327. 
Paratypes in the British Museum. 
The species seems to be related to B. semifartus Méllendorff. 
The shell, however, is distinctly larger and more strongly 
sculptured, and has the last three whorls deeper, the mouth 
larger, the umbilicus apparently deeper, the body-whorl 
subcarinate instead of evenly convex in vertical view and 
the lip still more expanded. B. semifartus (Méllendorff, 
Op. cit., Plate XV, Figs. 1-5) was described from several localities 
In Szechuan 
16. Buliminus (Holcauchen) gregoriana, sp. nov. 
(Plate 16, Figs. 7, 7a). 
The species is sbundant in the gorge of the Mekong north of 
Sha-wa-tsun at an altitude of 6,200 feet at the end of June. 
_ _ The shell is dextral, small, solid, elongate, somewhat 
fusiform , bluntly acuminate and Clausilia-like. It has eight 
whorls. The apex is minutely and obliquely mammillate. 
The suture is impressed and the whorls, especially the second 
and third, are somewhat convex. The first four whorls form 
the protoconch.. The whorls increase in depth gradually and 
the depth of the body-whorl is considerably less than that of 
the two preceding whorls together. This whor! is not or 
hardly constricted in the upper part. Its base is compressed 
th 
but not perforate at its base. The mouth is vertical, subquad- 
rate and comparatively small. The peristome is incomplete 
