ML Deo GmrPTION. OF A. NEWOsPECIES OF 
PRESHWATER CRAB PROM 
SOUTHERN IN Dias 
By J. R. HENDERSON, M.B., F.L.S., Superintendent, 
Madras Government Museum. 
PARATELPHUSA (LIOTELPHUSA) MALABARICA, N. SP. 
Carapace moderately flat, its length about three-fourths the 
greatest breadth, its depth about half the length. Under a lens 
the surface is seen to be minutely pitted, and there are fine 
oblique striae near the lateral borders; the striae are faintest 
posteriorly, and behind the short antero-lateral border of the 
carapace they curve downwards and forwards on to the under- 
surface of the branchial area. The anterior striae are finely 
crenulated. 
Cervical groove limited to a well-defined crescentic depression 
forming the posterior boundary of the mesogastric area; on 
either side of this cfescent, about quarter of the way back from its 
tip, is a somewhat ill-defined groove, which passes backwards and 
outwards for a short distance. The post-frontal mesogastric 
furrow is well-defined, and faintly bifurcate posteriorly. 
Front slightly more than two-fifths the greatest breadth of the 
carapace, strongly deflexed, and with the margin almost straight. 
Both the front and the upper orbital margin have a clearly 
defined elevated edge. Outer orbital angle moderately promi- 
nent ; lower orbital margin elevated, and finely crenulated. 
Antero-lateral borders of the carapace short, but well-defined, 
and faintly crenulated ; lateral epibranchial tooth small and 
subacute. 
Epigastric crests scarcely distinguishable as distinct eleva- 
tions, but represented by oblique faintly eroded patches on either 
side of the mesogastric furrow. Post-orbital crests low, but fairly 
distinct, commencing at a point nearly behind the inner orbital 
angle. 
Sixth segment of the male abdomen with its proximal and 
distal ends practically of equal width, but the segment slightly 
narrower towards the middle ; the length of the segment is greater 
than its breadth. 
Antennal flagellum very short. 
Terminal joint of mandibular palp bilobed. 
Exopodite of the external maxillipeds reaching the middle of 
the merus, and provided witha well developed flagellum. The 
ischium is smooth and not grooved, a very faint hollow, best seen 
at the proximal end, being the sole representative of the usual 
groove. ‘The merus is much broader than long. 
