402 Journal of the Asiatic Society of Bengal. [NS , XIX. 
ve! geirtancel considerably towards the mouth, convex below and 
subcarinate on the periphery. The penultimate whorl is 
highly convex and considerably deeper than the whorl and a 
half above it. The apical half whorl is raised and about half 
as deep as the first complete whorl. The suture is linear and 
deeply impressed. In ventral view the body-whorl is some- 
what elongate and the spire appears minute. ‘The mouth is 
oblique and comparatively narrow, Its height is considerably 
more than half that of the whole shell. The columella is 
feebly arched and its callus poorly developed. The sculpture 
consists of fine longitudinal striae on the bedy-whorl, set far 
apart but becoming more numerous and better develope ed o 
the youngest part of the whorl. The surface i is highly polished. 
Height sk shell ne ~. 825 mm. 
Max. dia ee ry ee J ; 
Height of | mouth .. i ea ee: 
T'ype-specimen. M 12496, 7.8.1. (Ind. Mus. 
Loeality. Shang- tung near N.W. shore of Evh hai (Lake 
Tali), Yunnan ( 2 subfossil) in iced beach, 
he ae shell has the lip incomplete. It resembles that 
of the European L. naticoides Fér. closely, but the spire is a 
little falar aw cog more impressed ‘and the body-whorl 
not so evenly conve 
Subfamily AMNICOLINAE. 
[ inelude in this subfamily the genera separated by some 
authors into Amnicolinae and Bithyniinae, as they are linked 
together by two subgenera of meee (Alocinma and Pseu- 
damnicola) both of which have a spiral but calcareous oper- 
culum. The name Amnicolinae ae undoubted priority. 
Genus Hydrobioides Nevill, 
Subgenus Parafossarulus Annandale. 
1924. Parafossarulus, Annandale, Journ. Malac. Soc., XVI, p. 28. 
have recently proposed this subgenus for the Chinese 
species which have the shell-sculpture (if present) spiral and 
lack a varix on the lip. Certain Burmese forms will also have 
to be included in it, the name Hydrobioides (s.s.) being confined 
to the type-species (a turrita), to the various forms of H. nassa 
to a new species which I hope to describe shortly. The 
shell resembles that of Pacliarobia Crosse and Fischer, but 
the operculum and the male organ are very different. 
Hydrobioides (Parafossarulus) delavayanus (Heude). 
1910. Bithinia delavayana, age Mém. Nat. Hist. Emp. Chinois, I, 
170, Plate XLIT, Fig. 
= Ser <2 ee, eg 
po Srsehor a ese re iat 
