BRACHYUKA. 363 



Leucosia urania, Herbst, 1801 A. 2, p. 220. 



Locality : Galle, one specimen. 



Description: Young male, C.l. = 171)0 ; C.b. -4-0.1. = 0'84. 



A series in the British Museum links this specimen with the adult form, from 

 which latter it differs in certain points : (l) fingers are crenulate in their distal half 

 only ; (2) hand is cristate on both borders (the lower crest is crenulate the 

 crenulations swollen into granules). 



Leucosia cumingi, Bell, 1855 A.2, p. 226. 



Locality : Coral reefs, Gulf of Manaar, one specimen. 

 Description: Ovigerous female, C.l. = 13 '00; C.b. -J-C.l. = 1'04. 



Leucosia hsematosticta, Adams and White, 1848 A.2, p. 229. 



Localities : Aripu coral reefs, Gulf of Manaar, two specimens (6, c) ; Station I. , off 

 Negomho, one specimen (a). 



Description: (re) male. (1>) ovigerous female, (c) ovigerous female. 



C.l 975 13-00 13-50 



C.b.-rC.l. . . . 0-97 1-00 0-98 



Leucosia pubescens, Miers, 1877 A.2, p. 233. 



Localities : Galle, one specimen ; pearl banks, Gulf of Manaar, three specimens ; 

 coral reefs, Gulf of Manaar, three specimens. 

 In an ovigerous female, C.l. = 18 "50. 



Philyra platychira, de Haan, 1841 A.2, p. 242. 



Localities : Coral reefs, Gulf of Manaar. four specimens ; pearl banks, three 

 specimens ; Trincomalee, three specimens ; Welligam Bay, two specimens ; Galle, six 

 specimens. 



An indication of sexual dimorphism is given by index Ch.l. -f-C.l. : 



For 12 adult males this has mean value 2 '32 and range of variation 2-23-2-40. 

 4 females T83 1-67-1-92. 



To this difference all the segments of the cheliped contribute. Thus 



Male means .... 

 Female means 



All have some very fine granulation on the posterior and lateral regions of the 

 dorsum of the carapace the specimens from " Coral reefs, Gulf of Manaar," have in 

 addition some rather large scattered granules on the lateral region. 



Some of the specimens fall under Klunzingers var. bidentata (K., p. 72). 



3 a 2 



