121 



Synopsis of the (Indian) species of Parapontocaris. 



I. The median carina of the 2nd abdominal tergum is bispinous : the 

 lateral spine at the base of the rostrum is remote from the other 



... P.andamanensis. 

 II. The median carina of the 2nd abdominal tergum is unispinous : of 

 the three spines on either border of the rostrum the basal one is not 

 very remote from the others ... ... ... ... p. bengalensis. 



71. Aegeon {Parajmntocaris) andamanense (Wood-Mason). 



Crangon andamanensis, Wood-Mason, Ann. Mag. Nat. Hist., Nov. 1891, p. 360. 

 Pontophilus andamanensis, Ortmann, Proc. Ac. Nat. Sci. Philad. 1895, p. 182. 

 Illustrations of the Zoology of the Investigator, Crustacea, Pl. IX. Fig. 2. 



Rostrum reaching only to the end of the eyes : on either lateral border are 

 three minute spines, one of which is at the base, while the other two are close 

 together near the middle. 



Orbital and post-antennal spines acute. All 7 carinas of the carapace are 

 salient, the median being 5-, the dorsal 4-, the lateral 5 or 6-, and the 

 marginal 3-toothed. 



The abdominal carinas are salient and sharp. The 1st tergum has 6 carinas, 

 all ending anteriorly in spines : the 2nd has 5, the median one of which is cut 

 into two antrorse spines, while the one on either side of it ends anteriorly in a 

 spine : the 3rd has 5, of which the median one alone extends to the posterior 

 border : the 4th has 7, the median one alone being prominent and complete : the 

 5th has 6, the middle two of which are very sharp : the 6th has 4, the middle 

 two of which are very prominent and are retrorsely 3 or 4-serrate. The 1st and 

 2nd abdominal pleura are very distinctly carinated near the edge: the 2nd 

 pleuron being twice as long as deep. Tip of telson spinate. 



Eyes broad, reniform. Antennular peduncle more than half the length of 

 the antennal scale : antennular flagella unequal, the inner (about half of which 

 lies beyond the antennal scale) being much longer than the outer and being 

 remarkably setose, the outer one being bare: in the male the shorter outer 

 nagellum is a little thicker, in the female it is vastly more slender, than the 



inner. 



Antennal scale more than two-fifths the length of the carapace and rostrum 

 (measured in the middle line), much longer than broad: its outer edge is 

 thickened and ends anteriorly in a very acute spine, its inner edge with long 

 setas. 



The stout external maxillipeds reach, by half the length of their terminal 

 joint, beyond the tip of the antennal scale ; their dorsal border is thickly setose, 

 as is that of the merus and carpus of the 1st pair of thoracic legs. 

 16 



