1922.] S. Kemp : Notes on Crustacea Decapoda. 213 



chelae show a similar development, but I have s*en one specimen 

 in which the gap was present in one chela only. 



In the female (text-fig. 59c) the merus is rather more slender, 

 about 6"5 to 7*0 times as long as wide and equal to or a little 

 longer than the carpus. The carpus is from 5 to 525 times as long 

 as its distal breadth and, as in the male, bears a conspicuous distal 

 tooth on the inner side. The chela is from r6 to r8 times the length 

 of the carpus. The palm is equal to, a little longer or little shorter 

 than the carpus and is from 1*3 to i'6 times as long as the fingers. 

 The fingers have inturned tips and may be provided with small in- 

 conspicuous teeth on the proximal half or third of their cutting 

 edges. 



The last three peraeopods are moderately slender ; the fifth do 

 not reach the apex of the antennal scale. In the third pair (text- 

 fig. 59^) the merus is from 9 to 10 times as long as broad. The 

 propodus bears long spinules on its posterior margin and is from 

 2*8 to 3'3 times as long as the dactylus. The dactylus is simple 

 and slightly curved with a few setae on its anterior margin; its 

 length is from 6 to 6*5 times its basal breadth. 



The sixth abdominal somite is about i'5 times the length 

 of the fifth. The dorsal spines of the telson are so arranged as to 

 divide its length into three equal parts. 



The largest specimen, a male, is about 23 mm. in length. 



Specimens from the Gulf of Manaar were almost completely 

 transparent when alive, minutely speckled with red and blue. In 

 some individuals a blue patch was visible at the ends of the merus 

 and carpus of the second legs and a brownish red patch on the 

 outer side of the propodus. 



Stimpson's description agrees in every particular with the 

 large males that I have examined, except that the chela of the 

 second legs is said to be nearly three times the length of the 

 carpus with fingers less than half the length of the palm. The 

 assumption that Stimpson described a more fully developed 

 male than any I have seen will fully account for these discrepan- 

 cies. 



In many respects P. grandis agrees with P. andamanensis. 

 It differs, however, in its deeper rostrum, in the stronger spine 

 at the distal end of the first antennular segment, in the much 

 stouter merus and carpus of the second legs of the male and in 

 the shorter and stouter legs of the last three pairs. The merus of 

 the third legs is only 10 to 11 times as long as wide in P. grandis, 

 from 15 to 16 times in P. andamanensis. 



C 384/1. Kilakarai, G. of Manaar, S. Kemp, Feb., 1913. Many. 



<>-2 fms. 



C^ 5 'i. 



Pamban, (>• of Manaar. 



S. Kemp, Feb. 



. I9I3- 



One. 



C 386/1. 



Cochin backwater, near 

 Ernakulam, S. India. 



F. H. Gravely, 

 1914. 



Sept., 



Thirteen 



C337/'. 



N. Cheval Paar, Ceylon. 



T. Southwell, 



Nov., 



Six. 



C 3 38/i. 



Pa way I., Mergui Ar- 

 chipelago. 



1910. 

 ' Investigator,' 

 1914. 



Feb., 



Two. 



