416 Journal of the Asiatic Society of Bengal. [N.S., XIX, 
All the specimens taken by the Gregory expedition are 
from the upper Yangtse system and | have no evidence for 
the occurrence of the species further west. Precise localities 
are Ho-ching (7,800 feet) and Shihku (6.200 feet). In Japan 
the species occurs at low levels and is common round Lake 
Biwa, but not in the lake itself so much as in rice-fields, etc. 
Most of the Yunnan specimens are from a swampy lake. 
Family LIMNAEIDAE. 
Genus Limnaea (auct.). 
The Chinese species of this genus need revision and there 
can be no doubt that far too many have been described. This, 
indeed, is so in all countries. Fortunately I have the type- 
specimens of the two Yunnan species before me. One 0 
these species occurs also in Indian territory and has been very 
fully considered by my assistant Mr. Srinivasa Rao and my- 
self in an account of the Indian Limnaeidae we hope to pub- 
lish shortly. This is ZL. andersoniana Nevill, the other is 
. yunnanensis of the same author; they were both described 
from the late Dr. Jobn Anderson’s collection made in the west 
of Yunnan. A form of L. yunnanensis, for which a new name 
has to be found, was described later from Erh-hai by Neumayr 
under the inappropriate and incorrect name L. auricularia var. 
junnanensis. He was evidently unaware of its relationship 
o L. yunnanensis Nevill, if he knew of the description of that 
form. I propose the new name L. yunnanensis f. distensa for 
this form. 
Limnaea andersoniana Nevill. 
1921. Limnaea andersoniana, Annandale and Prashad, Rec. Ind. Mus., 
XXII, p. 574, Plate VIII, Figs. 1-6. 
Further investigations extend the range of L. andersont- 
ana on the North-West Frontier of India, in the Western 
Himalayas and in Turkestan. We find. indeed, that nearly all 
the Indian specimens hitherto referred to L. truncatula really 
belong to this species, though the true L. truncatula occurs at 
high altitudes in Chitral. The two species are related in an 
interesting manner but may be distinguished by the much 
shorter spire in all forms of L. andersoniana. 
Specimens were taken at Yung-Chang (5,500 feet) on a tri- 
butary of the Upper Salween. They all belong to the typical 
phase of the species. : : 
Type-specimen. M +2425, 7.81. (Ind. Mus.). 
3 a , 
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