1919.] N. ANNANDALE & B. PrasHapD: Gastropod Molluscs. 111 
The height of the shell is from 12 to 13 the maximum dia- 
meter; the height of the mouth at least twice its maximum dia- 
meter. The height of the shell is from 12 to 12 that of the mouth 
and the maximum diameter from 13 to 21 that of the mouth. 
Capt. Boulenger obtained a number of living specimens in the 
Khandag Creek at Basra. 
The specimen recently figured by one of us and assigned pro- 
visionally to L. peregriformis, Iocard, is a young shell of this 
species. It differs considerably from older ones. Adult shells only 
differ from a series from the Rhineland in the Indian Museum, 
labelled L. ovata var. inflata, in having the upper surface of the 
body-whorl flatter and more depressed round the suture. 
Limnaea cor, sp. nov. 
(PL LE figs, as) 
The shell is moderately small (less than 15 mm. high), thin 
and fragile, diaphanous, tinged with rose-pink when fresh, con- 
spicuously striate longitudinally, and remarkable for its short, erect 
acuminate spire, the base of which is deeply depressed, and its 
large, irregularly heart-shaped, transverse body-whorl, the maxi- 
mum diameter of which is practically the same as the height. 
In dorsal view the following particulars are apparent: The 
spire consists of three whorls and is not more than ¢ as high at 
the body-whorl. The apical whorl is minute and rounded, the 
second at least three times as deep and broad as the first, which 
is set upon it nearer the inner than the outer margin of the shell. 
It is somewhat convexly flattened above and its outer margin 
slopes gradually outwards and downwards, while its inner margin 
is vertical. ‘The third whorl, which is at least five times as large 
as the second, possesses the same characters in a more developed 
manner. ‘The suture of the spire is oblique, linear and depressed, 
but not very deeply. The body-whorl is bilaterally very asym- 
metrical and irregularly heart-shaped. Its upper surface is broad- 
ly flattened and decidedly angulate at its outer margin. The 
suture just above it is deep and broad. ‘The inner margin is con- 
spicuously Z-shaped. In its upper half it is very convex, repre- 
senting an arc of nearly a semicircle. It then slopes gradually 
inwards for some distance, and finally projects outwards to form 
a semicircular lobe corresponding to the outer anterior extremity 
of the lip. Just above this lobe there is a broad, slanting longi- 
tudinal depression on the surface of the shell. The outer margin 
of the whorl possesses a fairly even convexity in an arc greater 
than a semicircle, but its middle region is often more or less flat- 
tened and straight. The upper and outer part of the whorl is 
tumid, but the surface slopes somewhat abruptly towards both the 
lip and the anterior extremity of the shell. The sculpture on this 
surface is conspicuous even to a good naked eye, but has a very 
delicate appearance. It consists, as seen under a powerful lens, 
