190 COLLECTIONS FROM MELANESIA. 



4. Oncinopus aranea. 



De Haan, Faun. Japan., Crust, p. 100, pi. xxix. fig. 2 (d ?)> and 



pi. H (1839). 

 Oncinopus neptnnns, Adams $• White, Zool. ' Samarang,' 1 Crust, p. 1, 



pi. ii. tig. 1 (1848). 

 Oncinopus subpellucidus, Stimpson, Proc. Ac. Nat. Sci. Philad. p. 221 



(1857 ) ; Haswell, Cat. Australian Stalk- and Sessile-eyed Crust, p. 5 



(1882). 

 Oncinopus anirulatus, Ilasiccll, Proc. Linn. Soc, K. S. Wales, iv. 



p. 433 (1880). 



Specimens are in the collection from Port Jackson, 5-7 fms. 

 (No. 104), and Port Molle, 14 fms. (No. 93). Besides the above 

 specimens the .British-Museum series includes examples from Port 

 JacksoD (J. Brazier §c), from Brisbane Water, Queensland (Mac- 

 gillivray, H.M.S. ' Battlesnake '), from the Mindoro Sea (A. Adams, 

 H.M.S. 'Samarang'), and from the New Hebrides (J.MacgilUvray)* 



Oncinopus subpellucidus, Stimpson, from Port Jackson, only differs 

 (according to its author) from O. neptunus in the somewhat smaller 

 and slenderer terminal and penultimate joints of the posterior legs, 

 and can scarcely be regarded as distinct. Oncinopus araneus of 

 De Haan (the species on Avhich the genus was originally founded) 

 was regarded by Adams and White as distinct from O. neptunus, on 

 account of the much shorter legs, more deeply-incised front, with 

 more angulated lobes ; but there is an adult specimen from Port 

 Jackson, in Dr. Coppinger's collection, in which the legs are only 

 twice as long as the carapace, and quite as robust as in De Haan's 

 figure of 0. araneus ; and in a male from Brisbane Water, Queens- 

 land, in the Museum collection, the chelipedes have their palms 

 dilated, just as in the Japanese species. In consideration of the 

 evident variability of the length and robustness of the legs in this 

 genus, I have considered it necessary to nnite all the described 

 species under De Haan's original designation, O. araneus. 



5. Menaethius monoceros (Latr.). 



A male is in the collection from Port Denison, Queensland, 4 fms. 

 (No. 111). I have in a previous Beport* remarked upon the wide 

 distribution of this common Oriental species, and for the numerous 

 synonyma would refer to A. Milne-Edwards's report on the Crustacea 

 of New Caledonia f . 



A female received in Dr. Coppinger's second collection from Prince 

 of Wales Channel (No. 109) differs widely in its broader, much more 

 strongly tubercnlated carapace from the male from Port Denison ; 

 in these particulars it closely resembles specimens from the Mauritius 

 in the British-Museum collection. Specimens from Shark Bay, West 

 Australia (Sun/eon Bayner, H.M.S. ' Herald ') nearly approach the 

 Mauritius specimens in these particulars. 



* Philosoph. Trans. Eoy. Soc. clxviii. p. 485 (1879). 

 t Vide Nouv. Archiv. Mus. Hist. Nat. viii. p. 252 (187i 



