REPORT ON THE BRACHYURA. 
105 
The species, all of which are Oriental, are small. The following have been 
described 
Ceratocarcinus longimanus, Adams and White. North Borneo ; Balambangen. 
Ceratocarcinus speciosus , Dana. Viti Levu, Fiji Islands. 
Ceratocarcinus dilatatus, A. Milne Edwards. New Caledonia. (This species is 
nearly allied to and may be a variety of Ceratocarcinus longimanus). 
Ceratocarcinus spinosus, Miers. Oriental Seas. 
Ceratocarcinus longimanus, Adams and White. 
Ceratocarcinus longimanus, Adams and White, Proc. Zool. Soc. Lond., p. 57, 1847 ; Crust, in 
Zool. H.M.S. “Sainarang,” p. 34, pi. vi. fig. 6, 1848. 
Arrou (Aroe) Islands, September 18, 1874 (an adult male). 
■ This specimen has the rostral and lateral spines longer, and the prominences of the 
dorsal surface of the carapace more developed than in White’s figure, or in a specimen 
bearing his name in the collection of the British Museum from Borneo. In these 
characters it more nearly approaches Ceratocarcinus dilatatus, A. Milne Edwards , 1 from 
New Caledonia, which indeed is only distinguishable by its broader carapace, and may 
perhaps be regarded as a variety of Ceratocarcinus longimanus. 
The dimensions of the Challenger specimen are as follows : — 
Adul t 8 . 
Lines. 
Millims. 
Length of carapace, ....... 
2 
4-5 
Length of a rostral spine, about ..... 
1 
2-5 
Breadth of carapace to base of lateral spine, .... 
2 
4-5 
Length of a chelipede, about ..... 
6 
. 12-5 
Length of first ambulatory leg, nearly .... 
6 
12- 
Ceratocarcinus speciosus, Dana . 2 
This is another nearly allied species, but is apparently well distinguished by its much 
broader front and distinctly spinulose chelipedes. 
1 Nouv . Archiv. Mus. Hist. Nat., vol. viii. p. 256, pi. xiv. fig. a, 1872. 
2 Crust, in U.S. Explor. Exped., vol. xiii. p. 139, pi. vi. fig. 8, 1852. 
(ZOOL. CHALL. EXP. — PART XLIX. — 1886.) 
Ccc 14 
