BRACHYURA. 355 



fringe on under surface of meropodite of walking leg 4. In (B) hair is absent in these 

 regions. 



Post-cardiac transverse groove slight but distinct in (A) ; absent in (B). 



Third tooth of clypeiform expansion. (A) Less acute than in (B) ; points obliquely 

 forward ; has anterior border -~ posterior border = 0'54 (average of eight specimens). 



(B) Acute ; points laterally ; has anterior border -j- posterior border = 0*90 (average 

 of nine specimens). 



I do not suggest that the above distinctions would be absolute or their correlation 

 perfect for a large series. This would be to separate series (B) as a species apart from 

 C. gallus. 



In the British Museum is a specimen (adult female, Philippine Islands, 43.6) which 

 combines the ( A)-type of front with the (B)-type of the other characters. Another unites 

 the deep hepatic concavity of (A)-type with a more (B)-like front. BRITTO CAPELLO'S 

 figure suggests that his specimen had rougher, more prominent tubercles than (B). 



One of present series (B) has a line of hairs posteriorly as in (A) and traces of the 

 same occur in three others. 



It is best, I think, for the present, to consider the two groups as varieties which 

 one may call : (A), var. gallus, and (B), var. capellonis. 



The best distinction between them is perhaps the sha.pe and direction of the 

 3rd tooth of the clypeiform expansion, which may be expressed by index anterior 

 border -T- posterior border. Examination of this character in our series shows : 



Var. gallus . . Mean = 0'54 ; range of variation = 0-50-0*55 (8 examples). 

 capellonis. = 0'90 ; = 0-83-l'07 (9 ). 



Growth changes do not affect correlation much in these specimens : 

 In var. gallus, 10 specimens considered (6 young -I- 4 adult). 



6 females (1 adult). 4 males (3 adult). 



C.I 9-00-31-50 10-25-33-25 



C.b.^C.l. . 0-95- 0-98 0-95- 0'96 



C.b. 2 -i-C.l. . 0-81-0-86 0'78- 0-85 (Index decreases with size). 



Var. capellonis, 19 specimens (1 adult male). 



10 females. 9 males. 



C.I 7-25-2575 8-33'25 



C.b.i-rC.1. . 0-98- 1-00 0-95-1 



C.b. 3 -f-C.l. . 0-79- 0-88 0-74-0-90 (Index decreases with size). 

 (C.b.! = in front of clypeiform expansions. C.b. 2 = across 3rd tooth of clypeiform 

 expansions. ) 



Mursia bicristimana, ALCOCK & AND., 1894 A. 2, p. 150 ; A. Invest, pi. xxiv., fig. 5. 



Locality : Gulf of Manaar and Palk Straits, two specimens. 



2 z 2 



