1923.| Zoological Results of Expedition to Yunnan. 413 
parasitic leeches, as it undoubtedly does, but also in retaining 
water in the cavity when the animal is aestivating or hiberna- 
ting. Certain forms of ZL. lecythis are known to bury them- 
selves in the mud in dry weather and to be capable of pro- 
ionged existence in a torpid state. 
Lecythoconcha lecythis (Benson). 
1921. oe eae gues hg Annandale, Rec. Ind, Mus., XXII, pp. 247 
(F 11), 545, 552, 553, 554, Figs. 3C, 6A, 7A, Plates VevViz 
Figs. ke 3 
The protoconch of this species is very characteristic (op. 
cit., p. 247, fig. 11). Its apex is depressed and concave and 
oS ia complete whorl at first projects upwards and then 
esce 
The. specimens collected by the Sladen Trust Expedition 
= ne to the small rice-field phase (ampulliformis Evdoux) 
d there are many specimens of the same phase from western 
Sanadk in the Indian Museum. We have also a perfectly 
typical shell of the large marginal phase from Erh-hai (J. Cog- 
gin Brown coll.). This probably marks the eastern limit of 
the range of the larger phases of the species, the smaller 
phase of which ext tends from the upper waters of both the 
Chindwin and the Irrawadi to Hainan and possibly Japan. 
Ype-specimens. 2300, Ind Mus. 
Form crassior, nom. nov. 
1909. Vivipara {chinensis (2) var.] compacta, Kobelt, Paludina, Conch. 
Cab. (n.7.), p. 113 (in part), Plate XVIII, Fig. 8, nec Nevill Hand 
List Moll. Ind. Mus., I1, p. 2\) (1885). 
1890, Paludina lecythoides, Heude (nec NT Mém. Hist. Nat. Emp. 
. 174, Plate X XIX; 
Several specimens from a pool in a rice-field at Yangchang 
(Salween system), altitude 5,500 feet and some from Howan on a 
tributary of the Mekong (west bank), altitude 5,300 feet. Also 
own from Bhamo in Burm The form, therefore, occurs on 
the upper waters of the thie western rivers of Yunnan. 
‘e has been confusion between this form and Nevill’s 
Cab chinensis, var. s Peas The latter is a form of 
sis, 
Species of his formosensis actually belongs to the type-series of 
Nevill’s much earlier compacta, Kobelt’s figure of compacta, 
from a shell from Hainan, is accurate for my new form, whereas 
