928 



DR. W. T. CALMAX OK 



confident tliat they would be found to differ essentially from the 

 smooth variety of P. idee. It may be noted that, in having parts 

 of' the surface of the carapace slightly scabrous, some of our 

 specimens agree with P. sintangensis de Man, which Couti6i-e 

 regards as a varietal form of P. ritsemce. 



The following table gives (in millimetres) the more important 

 measurements of all the specimens that have one or both 

 chelipeds of the second pair preserved. The " total length " of 

 the body and also the " total length " of the chelipeds of the second 

 pair are only approximate, on account of the impossibility of 

 straightening the specimens without injury. In an ovigerous 

 female the eggs measured "5 x '4 mm. 



Measvu^ements of Palcemon ritsemce. 



Pal^mon hildebrandti Hilgendorf . (Plate XCII.) 



Bithynis (^) hildehrandti Hilgendorf, Sitz.-Ber. Ges. ]S"aturf. 

 Freunde Berlin, 1893, p. 244; Coutiere, Ann. Sci. Nat. Zool. (8) 

 xii. 1900, pp. 250, 256, 259 ; Ortmann, Bronn's Thierreich, 

 Crustacea, ii. 1901, p. 1292 ; Ortmann, Proc. Amer. Phil. Soc. 

 Philadelphia, xli. 1902, p. 274. 



