550 COLLECTIONS FROM THE WESTERN INDIAN OCEAN. 



The single example was collected at Providence Island, 24 fms. 

 (No. 215). 



It only differs from Riippell's figure (t.c. p. 17, pi. iv. fig. 3) in 

 the somewhat broader carapace and shorter granulated chelipedes, 

 and I do not. venture, therefore, to separate it as a distinct species. 



Ebalia granulata has been hitherto a desideratum in the Museum 

 collection. Originally described by RiippeU as Nursia granulata*, 

 it was retained as a doubtful member of that genus by Milne- 

 Edwardsf, who had seen no specimens. Prof. T. Bell, in his mono- 

 graph of the familyj, makes no mention of the species; but it is 

 included by Von Martens in his conspectus of the East-African Crus- 

 tacea §, who refers to it as Ebalia granulata. 



The nearest ally to this species with which I am acquainted is 

 Ebalia m Maris, A. M,-Edwards||, a species from Epolu, Samoa 

 Islands, which is only very briefly characterized, but which differs 

 in the shorter dactyli of the chelipedes and the much more robust 

 ambulatory legs. Ebalia orientalis, Kossmann^j, from the Red Sea, 

 differs altogether in the form of the carapace, which is subrhomboidal, 

 with deep concavities behind the antero-lateral margins. 



72. Calappa hepatica (Linn.). 



Mozambique, beach (No. 224) ; an adult male. 

 This very common species has been referred to in the preceding 

 part of this Keport (p. 257). 



73. Calappa gallus (Herbst), var. bicornis. 



This variety is so nearly allied to the typical Calappa gallus 

 (Herbst), with which I believe the W.-Indian C. galloides, Stimpson, 

 to be identical, that it will suffice here to point out the characters 

 by which the specimens in the Museum collection may always be 

 distinguished. The rostrum is not, as in the ordinary condition of 

 C. gallus, entire and obtuse or very slightly excavate at its distal 

 end, but is deeply emarginate, so as to consist of two distinct lobes 

 or spines, on the outer side of each of which there is a smaller 

 tooth, which tooth is, however, sometimes distinguishable in the 

 typical C. gallus ; the upper margins of the orbits are denticulated, 

 not smooth as in the typical form, the tubercles of the carapace are 

 usually more conical and acute. It may not improbably prove to 

 be a distinct species. 



* Beschreib. 24 kurzschw. Krabben des rothen Meeres, p. 17, pi. iv. fig. 3 

 (1830). 



t Hist. Nat. des Crust, ii. p. 138 (1837). 



\ Trans. Linn. Soc. xxi. pp. 277-313 (1855). 



§ In Von der Decken's Keisen in Ost-Afrika, iii. (I) p. 110 (1869). 



|| Journ. Mus. Godeffroy, iv. p. 85, pi. xiii. fig. 2 (1873). 



* Malacostraca, in Zoolog. Ergebn. roth. Meeres, i. p. t'.5, pi. i. fig. 6, pi. iii. 

 fig. 16(1877). 



