I9I5-] Fauna of the Chilka Lake : Crustacea Decapoda. 279 



end of the lake in water which was slightly brackish; no ovigerous specimens 

 were seen out of many collected during this month at other localities in fresh water, 

 and it appears that the species breeds only in water containing some trace of salinity. 



In addition to a long series from the Chilka Lake, there are in the Indian 

 Museum specimens of U. indica found by Dr. Annandale at Ennur and in the Adyar 

 R. near Madras, and others which I myself obtained living in pure sea-water inside 

 the fringing coral-reef at Kilakarai at the northern end of the Gulf of Manaar. The 

 specific gravity of the water in which specimens were taken at Ennur in January 

 1915, varied from i-ooo to 10045; the collection includes numerous ovigerous 

 females, but there had been a sudden inflow of fresh water, abnormal at that time of 

 year, just previous to their capture. 



The type specimens bear the number 8997-8/10 in the Indian Museum register. 



Genus PERICLIMENES, Costa. 



1852. Anchistia, Dana, U. S. Explor. Exped., Crust., I, p. 577. 

 1898. Periclimenes, Borradaile, Ann. Mag. Nat. Hist. (7), II, p. 380 



Periclimenes demani, sp. nov. 

 (Plate XIII, fig. 10.) 



The carapace is smooth with broadly rounded antero-lateral angles. Supra-orbital 

 and hepatic spines are present, the latter being placed a little below the level of the 

 antennal spine. 



The rostrum, in the female, reaches almost or quite to the apex of the antennal 

 scale, sometimes a little beyond it in the male ; in lateral view the blade is broad in 

 front of its middle point and is very slightly upturned towards the apex. On the 

 upper edge there are 7 to 9 teeth and on the lower 1 to 3 ; in nearly all the specimens 

 there are 8 or 9 above and 2 or 3 below. The proximal tooth is remote from the rest 

 of the series and is situated on the carapace at the junction of the middle and anterior 

 thirds of its length. The second tooth is placed over the orbit and from this onwards 

 the teeth are, as a rule, regularly spaced; the distal tooth is usually situated close to 

 the apex (pi. xiii, fig. 10). 



The cornea of the eye is a trifle wider than the stalk and in the female is, as in 

 some allied species, traversed by a dark band. The band commences near the ocellus 

 — which in this species is conspicuous — and extends round the inner half of the 

 cornea, meeting the stalk again on its ventral side. 



The antennular peduncle »text- fig. 27^) extends to about two-thirds the length of 

 the antennal scale. The broad basal segment is more than one and a half times the 

 length of the second and third segments combined ; its outer margin is furnished 

 proximally with a spine-like lateral process and terminates in a stout tooth; the 

 margin inwards of this tooth is strongly sinuous and is bordered with setae. The 

 outer flagellum is unequally bifid distally and the thickened part (i.e. the fused 

 portion, composed of 12 to 14 segments, + the stouter and shorter of the two terminal 



