36. ZOOLOGICAL RESULTS OF THE PERCY SLADEN 
TRUST EXPEDITION TO YUNNAN UNDER THE 
LEADERSHIP OF PROFESSOR J. W. GREGORY, 
F.R.S. (1922). 
LAND MOLLUSCS. 
By N. ANNanpDALE, D.Sc., F.R.S., ¢.A.8.B., C.LE., Zooiogical 
Survey of India. 
The country traversed by Professor Gregory’s expedition 
comprises the upper region of four great river-systems, those 
of the Irrawadi, the Salween, the Mekong and the Yangtse. 
Conditions were unfavourable at the time of his tour for the 
collection of land molluscs and although he obtained a 
considerable number of specimens, only 18 recognizable species 
and one subspecies are represented. These cannot be regarded 
as completely representative of the fauna of the province, or 
even of that of the localities visited, but the collection casts 
an interesting light on the molluscs of a region hitherto little 
known to malacologists. There is no reason to think that 
Yunnan is less rich in land snails than other parts of China. 
known from that province compared with those known from 
others adjacent to it. 
Of the 19 forms in the collection, 6 are here described as 
new. All of these but one belong to the genus Buliminus or 
Political divisions are not necessarily of importance in 
zoogeography and it will be more profitable to consider the 
i unn 
uch a list, which would of course be complete only from 
& purely literary point of view, would comprise some 

16ee MOllendorff, Ann. Mus. Hist. Nat. St. Pétersburg, VI, p. 404, 
? Gude, Malacologist, IX, p. 1 (1902). 
