CRUSTACEA. 



PART V. 



AMPHIPODA. 



By The Rev. Thomas R. R. StebbinCx, M.A., F.R.S., F.L.S., 

 F.Z S., Hon. Member New Zealand Institute, Fellow of 

 King's College London, Hon. Fellow of Worcester College, 

 Oxford. 



The present Report is not concerned with a large number of new 

 species. Of these there are only thirteen. They are distributed 

 among the same number of genera, of which three are new. 

 Incidentally also a new genus, Parawaldeckia, is instituted for 

 a species previously called Nannomjx thomsoni, from New 

 Zealand, and not as yet recorded in Australian waters. The new 

 genus Ochlesis is worthy of note, since by the character of its 

 maxillipeds it forms a link between the Gamniaridea and the 

 Hyperiidea. For this reason it appears to justify the institution 

 of a new family, the Ochlesidse. In all, forty-four species have 

 been identified among the specimens of the " Thetis " collection. 

 In the genera Eiisiroides, Eurystheus and Icilius, it is possible 

 that future stringency of specific determination may reduce the 

 number of species here noted. Some reductions in regard to other 

 genera are suggested in the report itself. Thus, the genus Vijaya, 

 Walker, 1904, is made a synonym of Haswell's Amaryllis, and 

 Walker's Gallea tecticauda, of the same date, loses its significant 

 specific name by identification with Haswell's earlier Cyproidea 

 ornata. 



For the preoccupied Eurystheus dentatus, Holmes, E. alaskensis 

 is proposed. 



Various problems in regard to Australian Amphipoda remain 

 still unsolved, but the two species Paradexamine flindersi and 

 Dryopoides westvjoodi, of which the "Challenger" Expedition 

 obtaiced a lamentably scanty supply, are now indebted to the 

 "Thetis" specimens for their proper places in classification. 

 Some strange cases of superficial resemblance and actual diversity 

 are afforded by fyhimedia ambigua, Haswell, and Iphimedia 

 discreta, sp.nov., in one and the same genus, and by Lcetmato- 

 philus hystrix (Haswell), and Podocerus hystrix, sp.nov., in two 

 neighbouring genera. In Melita fresnelii (Audouin), Faracera- 

 docus micramphopus, sp.nov., and Ceradocihs rubromaciolalus 

 (Stimpson), the striking fretwork of the pleon segments is an 

 ensnaring temptation to mix up species which require to be sorted 

 apart. As noticed under Eurystheus thonisoni, the gnathopods 



