260 W. Lilljeborg on the Genera Peltogaster and Liriope. 
Corbicula Quilonica, B. 
Testa ineequilaterali, trigono-rhomboidea, gibba, tenui, concentrice 
subremote costata, costis postice evanescentibus, sulcis intermediis 
latioribus, sub lente decussatim striatis, albida vel lutea, radiis 
fuscis angustis ornata ; umbonibus prominentibus, apice fere eroso ; 
latere antico breviore, valde arcuato, angustiore, postico striato, 
latiore ; superne et basin versus angulata; margine ventrali me- 
diocriter arcuato ; ligamento oblongo intra nates attenuato ; pa- 
gina interna valde concava, albida, maculis radiisque purpureis 
ornata; dente mediana valvee dextree duplici, dentibus lateralibus 
brevibus serrulatis. 
Lat. 10, long. 8, crass. 53 mill. 
Habitat prope Quilon in stagno cum Clea Annesleyi. 
The younger shells are more gibbous towards the umbones in 
proportion to their length than the larger specimens. A tawny- 
yellow epidermis covers the fresher specimens. The rays are 
numerous, more or less broad, sometimes appearing as mere 
lines of small spots, and occasionally spreading so as to make 
the surface appear nearly black. The species is very distinct 
from any of the Corbicule collected by myself or obtained from 
Northern or Central India. The shortness of the lateral teeth, 
on the anterior side especially, is a notable character, as well as 
the inzequilateral form, which is more conspicuous in the young 
than in the adult shell. 
Dursley, August 29, 1860, 
Note.—The water contained in the tank which is inhabited 
by Clea Annesleyi and Corbicula Quilonica is probably brackish. 
A parcel, received while this paper was passing through the 
press, includes specimens of a Cerithium resembling C. eximium, 
Sow., obtained from the same pond, which has a muddy bottom 
and grassy banks perforated by a small crab. In a large speci- 
men of Clea, 10 mill. in length by 54 in breadth, with five whorls 
and a less eroded apex, the last whorl scarcely attains + of the 
total length of the shell. 
September 3, 1860. 
XXXIV.—On the Genera Peltogaster and Liriope of Rathke. 
By W. Litisesore. 
[With a Plate.] 
[Continued from p. 173.] 
Liriope pygmea, Rathke. 
Beitrage zur Fauna Norwegens, Nova Acta Acad. Leop. 1843, 
vol. xx. p. 60, tab. 1. figs. 8-12. Sime dubio mas junior, 
tamen non ineunte etate. 
On the 28rd of July, 1858, the author found in the sea, near 
