VII. RHOMBOSOMA 23 



VII. RHOMBOSOMA Regan, 1914. 



Rhombosoma Regan, Trans. Zool. Soc. London, 20, 283, 1914. 



Orthotypq. — Nematocentris nov^-guine^ Ramsay and Ogilby. 

 Range. — Fresh and brackish waters of New Guinea and neighboring islands. 



This genus, as well as others proposed by Regan at the same time, 

 is very closely related to Melanot^nia, differing from that genus in 

 details of mouth structure and dentition. It may be found convenient 

 to reunite some of these groups with Melanot.enia. We retain them 

 all, however, awaiting the fresh evidence of newly described or re- 

 discovered species. 



Mr. Regan recognized but two species of Rhombosoma after ex- 

 amining a large series of specimens, including paratypes of most of the 

 nominal species. 



11. Rhombosoma goldiei (Macleay), 1884. 



Aristeus goldiei Macleay, Proc. Linn. Soc. N. S. Wales, 8, 269, 1883 (1884); 



Perugia, Ann. Mus. Genova, 34, 548, 1894. 

 Rhombatractus goldiei Ogilby, Proc. Linn. Soc. N. S. Wales, 21, 134, 1896. 

 Rhombosoma goldiei Regan, Proc. Zool. Soc. London, 339, figs. 1-2, 1914. 

 Type-locality. — Goldie River, New Guinea. 

 Nematocentris nov^-guine^ Ramsay and Ogilby, Proc. Linn. Soc. N. S. Wales 

 (2) 1, 13, 1886 (1887). 

 Rhombatractus nov^-guine^ Ogilby, Proc. Linn. Soc. N. S. Wales, 21, 134, 



1896. 

 Rhombosoma nov^e-guine^ Regan, Trans. Zool. Soc. London, 20, 283, pi. 31\ 



figs. 5-6, 1914; Proc. Zool. Soc. London, 339, 1914. 

 Type-locality. — Strickland River, New Guinea. 

 Rhombatractus affinis Weber, Nova Guinea, 5, 234, pi. 11, fig. 5, 1908; 9, 565, 1913 ; 

 Regan, Trans. Zool. Soc. London, 20, 284, 1914. 

 Type-locality. — New Guinea : "Timena, Bach der in den Sentani-See miindet ; 

 Siisswasser." 

 Rhombatractus kochii Weber, Nova Guinea, 5, 237, pi. 11, fig. 6, 1908; 9, 562, 1913; 

 Regan, Trans. Zool. Soc. London, 20, 284, 1914. 

 Type-locality. — Southern New Guinea: "Wasserlaufe, die in die Miinding des 

 Merauke-Flusses ausmunden ; vermutlich Brackwasser." 

 Rhombatractus weberi Regan, Ann. Mag. Nat. Hist. (8), 1, 155, 1908; Trans. 

 Zool. Soc. London, 20, 284, 1914. 

 Type-locality. — Fly River, New Guinea. 

 Rhombatractus gathering De Beaufort, Zool. Ans., 36, 250, 1910; Bijd. Dicrk. 

 Amsterdam, 106, pi. 2, fig. 1, 1913; Regan, Trans. Zool. Soc. London, 20, 284. 

 1914. 

 Type-locality. — Brook flowing into the Rabiai River, Waigiou. 

 Rhombatractus senckenbergianus Weber, Ahh. Senckcnb. Nat. Ges., 34, 25. 

 pi. 1, fig. 2, 1911; Regan, Trans. Zool. Soc. London, 20, 284, 1914. 

 Type-locality. — Terangan Island, Aru Islands ; in fresh water. 

 Range. — Fresh and brackish waters of New Guinea, the Aru Islands, and Waigiou. 



