1919. | N. ANNANDALE & B. PrasHap: Mollusca. 39 
lateral tooth is oblique but not bent. It has five cusps resemb- 
ling those of the central tooth and bears a broad blunt process 
on its disk. ‘The inner marginal has four or five subequal cusps 
and is much narrower than the outer. The outer marginal is rela- 
tively long and narrow as a whole, with four small cusps; but its 
outer margin is produced some distance below its upper edge into 
a broad, blunt lobe. On the upper part of the inner margin there 
is a similar but much less prominent projection. — 
Type-specimens. No. M 11535/2 Zool. Surv. Ind. (Ind. Mus.). 
The type-series was found by Mr. (temporary Major) W. J. 
Good, at the time Administrative Commandant, South Central 
District, Eastern Persian Cordon, at Kaindak (long. 60° 48’ E., lat. 
29° 48’N.), Persian Baluchistan. The molluscs were collected on 
damp alga at the edge of a small spring of slightly brackish 
water. The water comes out of a patch of earth 20 to 30 feet 
square and forms a mere trickle. 
At first sight the shell of this species is very like that of the 
dwarfed Persian form of M. praerosa (Linn.) called by Nevill var. 
nana. It is, however, considerably narrower and more acuminate 
and has the spire very much longer. 
Family LIMNAEIDAE. 
The molluscs of this family found in Baluchistan and Seistan 
all belong to the genus Limmnaea in a wide sense, but fall into two 
very distinct groups, which we may call provisionally the group of 
L. auricularia and that of L. truncatula. Untilthe anatomy of the 
Limnaeidae of India and of Western Asia is better known it would 
be premature to discuss the nomenclature and status of these 
groups. ‘To that of L. auriculania belong L. persica, L. bactriana, 
L. iranica and L. gedrosiana, while L. truncatula and L. hordeum 
represent the group of the former species. 
Genus Limnaea, Lamarck. 
The Limnaeae found in the countries under consideration are 
all of small size and, except those of L. truncatula group, have 
thin, fragile shells, which are unpigmented or of very pale coloura- 
tion. They are all paludine forms. We have recognized six 
species. Although some of these resemble Palaearctic or Indian 
species in shell-characters, we have not felt justified in identifying 
any but the plastic L. truncatula with species known either from 
Europe, from Central Asia or from India. One peculiar species 
(L. hordeum) we assign, after a comparison of specimens, to a 
Mesopotamian form. ‘The resemblances in the shell in other in- 
stances are no more than resemblances, and in most cases precise 
information as to anatomical characters is deficient or altogether 
lacking. 
