1922.] S. Kemp : Notes on Crustacea Decapoda. 217 



at the distal end of the lower margin; it is from 1*2 to 1*3 times 

 as long as the carpus. The carpus is from 4 to 4"5 times as long 

 as its distal breadth and bears two stout spines at the distal end, 

 one on the inner side and one on the upper and inner aspect ; 

 interiorly the distal end projects a little, producing the appearance 

 of a tooth when seen in lateral view. The chela is from 2 to 2*5 

 times the length of the carpus and the palm is from ro, to 24 

 times as long as the fingers. The fingers (text-fig. 62c) frequently 

 but not always show an excavation in the middle of their cutting 

 edges as in P. grandis. Some specimens have comparatively 

 laige teeth on the fingers while others have only a few very small 

 teeth. 



In the female (text-fig. 6zd) the merus of the second peraeo- 

 pod is from i*o to 1*3 times as long as the carpus and is from 

 7 to 7"5 times as long as wide. The carpus varies from 4 to 55 

 times as long as its distal breadth ; the spine on the inner side is 

 well developed and frequently an acute process or short spine can 

 be seen on the upper and inner aspect, corresponding to the second 

 spine found in the male. The chela is from 1*4 to 21 times the 

 length of the carpus ; with palm from- 1*3 times to twice 1 as long 

 as the fingers. The fingers bear small teeth in the proximal half 

 of their inner margins. 



The last three peraeopods are stout; the fifth, when extended 

 foi wards, fall far short of the apex of the antennal scale. In the 

 third pair (text- fig. (~)2e) the merus is from 75 to 8*5 times as long 

 as broad ; the propodite bears a series of spinules on its posterior 

 edge and is from 35 to 4 times as long as the dactylus. The 

 dactylus itself is simple, very slightly curved, and generally with 

 one or two long setae in the middle of its anterior margin ; its 

 length is only from 4 to 4'5 times its basal breadth. 



The last abdominal somite and telson agree with those of 

 P. grandis. 



The largest specimen, a male, is about 24 mm. in length. 



Although the above account differs in some respects from 

 Paulson's description (as translated by Nobili) and from his figures, 

 I have little doubt that the identification is correct and that the 

 discrepancies are mainly due to errors in the original account. 

 A single adult male collected by Major R. B. Seymour Sewell in 

 the Red Sea, belongs almost without question to Paulson's species 

 and this individual is indistinguishable from specimens obtained 

 in the Andamans. The specimen which Balss has recorded as 

 P. elegans from St. John's I. in the Red Sea 2 apparently does 

 not belong to this species as the spine on the carpus of the second 

 leg is said to be absent. 



C. 389-90/1. Port Blair, Andamans. S. Kemp, March, Many. 



1915; Feb., March, 

 1921. 



1 In exceptionally large females only. 



2 Balss, Denk. math.-natitr'cv. Kl. K. Akad. Wien, XCI, p. 26 (1915). 



