BRACHYURA. 391 



granulated in var. confragosus ; in var. calappoides they are more or less smooth, low 

 and obsolescent and the general surface of the carapace tends to be pitted and uneven, 

 producing what Alcock aptly terms a " boiled " appearance. (6) The postero-lateral 

 angles are angular and spine-bearing in var. confragosus ; rounded in var. cala/ppoides. 

 (7) The greatest carapace-breadth is in var. confragosus, across the region of the 

 postero-lateral angle ; in var. cala/ppoides it is anterior to this region. (8) There are 

 two large tubercles on the inner border of the arm in var. confragosus, one about 

 one-third from its distal end and the other about one-third from its proximal end. 

 The latter is the larger, a good deal compressed from above downwards, and has a 

 small tubercle at its base ; in var. calappoides there are traces only of both. (9) The 

 rostrum is obliquely deflexed in var. confragosus ; vertically deflexed in var. 

 calappoides. 



The above characters show a fair degree of correlation ; the transitional forms tend 

 to combine intermediate conditions of most of them. The correlation is, however, by 

 no means perfect, e.g., a "Challenger" female from "off Tongatabu," in the British 

 Museum, combines with most characters of var. calappoides a considerable development 

 of the median dorsal spines. 



Lambrus (Parthenolambrus) beaumonti, Alcock, 1895 A.l, p. 276. 



Localities : Coral reefs, Gulf of Manaar, three specimens (a, d, e) ; south of Galle, 

 deep water, one specimen (b) ; Gulf of Manaar, deep water, one specimen (c). 



Description: (a) young $. (b) ovigerous ? . (c) ovigerous ? . (</) adult $ . (e) adult <j\ 



C.l 675 775 8-00 9"25 10-00 



C.b.-j-C.l I'll T06 T09 1-00 1-07 



Ch.l.-7-C.l. . . . 174 1-91 2-46 2"90 



The difference in ratio Ch.l. -=-C.l. between the two males both apparently adult 

 is interesting. In the present forms there is much variation in the size of gastric and 

 cardiac tubercles. They are both absent in the young female example (a), they are 

 both rudimentary in the larger of the two males (e), there is a blunt tubercle on each 

 of these regions in ovigerous female (b), finally, in the smaller male (d), there is a 

 stout spine on the gastric eminence, and a still stouter one on the cardiac. 



Lambrus (Parthenolambrus) harpax, Adams and White, 1848 A.l, p. 278. 



Locality : Pearl banks, one specimen. 



Description : A male, apparently young. C.l. = 14*25 ; Ch.l. -=-C.l. = 2"79. This 

 individual, belonging to a highly variable species, agrees with Alcock's description 

 of the Indian Museum specimen from the Andamans, excepting that the index 

 Ch.l. 4- C.l. is considerably higher. 



Cryptopodia fornicata (Fabricius), 1793 A.1, p. 282. 



Locality : Pearl banks, Gulf ot Manaar. one specimen. 



Description: A young male, C.l. (rostrum included) = 18 - ; C.b.-j-C.l. 1"46. 



