1923. ] Zoological Results of Expedition to Yunnan 405 
This species, which was described from the lake Hai-si 
near Erh-hai in Yunnan, is not represented in the Gregory 
collection, but I have examined a series of shells from that 
of Heude. From one of these my assistant Mr. Srinivasa Rao 
has extracted the radula. It agrees fairly well with Heude’s 
figure, except that three basal denticulations are present on 
each side of the central tooth, whereas he showed a simple 
ridge in this position. The laterals differ from those of Para- 
pyrguia in having no subsidiary denticulations at the sides 
of the cusp. 
Heude published figures of the apenas lamellae and 
of the head He shows the latter as bearing on the neck 
behind the eyes an intromittent organ iogiae like that 
of certain “ Hydrobiidae,” but as his figures were drawn from 
dried specimens no great reliance can be placed upon them. 
It seems to me not ‘improbable that the so-called penis was 
really a tld of the mantle. 
The species (and the genus) is known only from a small 
lake in Bu neighbourhood of Tali-fu. 
genus Parapyrgula Annandale and Prashad. 
1919. tn diye Fag ages of Parap) rosoe thenta), sal aria and 
Prashad, . Mus., XVI, pp. 416, 420, Figs. 1D 
The radula % monotype of this genus differs in so 
important a character (the presence of subsidiary denticula- 
tions on the cu usp of the lateral teeth) from that of Delavaya 
that they must be regarded as distinct. The structure o 
Suture of the shell is also very different and its perfectly 
veentiay outline with a single smooth spiral ridge is characteris- 
ic 
The shell differs from that of Pyrgula (including Neu- 
mayr’s subgenus Diana) in its much more expanded mouth 
uv 
P arapyrgula cogsini Annandale and Prashad. 
A large series of ee shells, with equally large or even 
larger series of those of Fenouilia bicingulala and Parapro- 
sosthenia gredleri, was obtained from the earth of ar raised 
i at Shang-kuan near the N.W. shore of Erh-hai. Dr. 
| See Walker, Univ. Michigan Mus. Publ. No. 6, p. 30, Fig. 102 

(1918). 
