568 '•' THETIS " SCIENTIFIC RESULTS. 



of species otherwise quite distinct seem to have been turned out 

 of the same mould. No doubt the same might be said of less 

 characteristic appendages, but in these it does not attract atten- 

 tion. It is singular that, so soon after Dr. Paul Mayer's institu- 

 tion of a new species of Dodecas from Australian waters, a third 

 species from the same locality should now be added to the same 

 small genus. 



An attempt is here made to recapitulate all the species of 

 Amphipoda as yet described from Australian and Tasmanian 

 waters. For the tribe or legion of the Gammaridea the order 

 adopted is that followed in my Amphipoda Gammaridea, 

 " Das Tierreich," Lieferung 21, 1906 ; for that of the Caprellidea, 

 Dr. Paul Mayer's admirable work, " Siboga-Expeditie," Mono- 

 graphic 34, Die Caprellidse, 1903 ; and for the Hyperiidea, the 

 " Challenger Reports," vol. xxix., 1888. 



The reckoning amounts to one hundred and eighty-two species. 

 A few of these at i)resent are not very clearly established. But 

 that defect will no doubt before long be remedied, and there is 

 good reason to expect that in course of time numerous additions 

 will be made to the inventory here presented. 



In forcing specific names into concord with generic termina- 

 tions I have followed the ruling of " Das Tierreich," though I 

 have long advocated the simpler plan of assuming that all species 

 in zoology are of the masculine gender. The old rule complicates 

 synonymy when a species is moved from one genus to another, 

 and involves the biologist in many needless anxieties. What 

 is he to do, for example, with .such a genus as Cepon, which is 

 not a neuter word, but the genitive plural of a masculine, being 

 the Greek rendeiing of the French proper name Desjardins 1 

 Even under the rule, as may be seen in this report, an insidious 

 technicality makes it wrong to say Streetsia porcella, because the 

 substantive i^orcellus is on a different footing from that of the 

 adjectival pusillus. But puerilities have long lives. 



AMPHIPODA. 

 Fami/y LYSIANASSID^." 



Lysianassidce, Buchholz, Zweite Deutsche Nordpolarfahrt, ii., 



1874, p. 299. 

 Lysianassidce, Stebbing, Das Tierreich, xxi., 190G, pp. 8, 717. 

 Lysianassidoi, Walker, Nat. Antarct, Exp., iii.^ 1907, pp. 3, 9, 



This family has no competitor in size among the Gammaridea 

 except the Gammaridse. In " Das Tierreich" forty-nine genera are 



