Mr. W. A. Has well on the Australian Amphipoda. 33 



Another new genus, Polycheria r is represented by two 

 species found in Port Jackson. It has the pereion broad, the 

 pleon compressed and carinate ; the antennas are of nearly 

 equal size, with long slender flagella, the superior pair being 

 devoid of secondary flagellura ; the mandibles are exappendi- 

 culate; the maxillipedes possess well-developed squamiform 

 processes ; the gnathopoda are subchelate, small ; the pereio- 

 poda are slender, and have all prehensile terminal joints ; the 

 posterior pleopoda are biramous ; and the telson is double. 

 Polycheria would belong to Dana's subfamily Isceance, but has 

 little in common with Isaia save the prehensile pereiopoda. 



In Chloris (mihi) the antennas are well developed, the 

 superior pair shorter than the inferior and provided with an 

 appendage ; the mandibles are palpigerous ; the maxillipedes 

 unguiculate, subpediform, provided with a squamiform process 

 on the basal joint only ; the gnathopoda are subchelate, un- 

 equal, the second pair being very large ; the posterior pleopoda 

 are biramous, with short, conical rami; and the telson is single 

 and elongate. 



Several species of Microdeuteropus occur in Port Jackson, 

 one of them having a close relationship to M. Webster ii, 

 another to M. gryllotalpa, and a third to M. anomalus, while 

 a fourth appears to have no precise homotype among northern 

 species. 



A new form allied to Microdeuteropus I have named Xeno- 

 cheira. It is distinguished by the remarkable form of the 

 posterior gnathopoda, the carpus of these organs being broad 

 and plate-like, projecting anteriorly, and articulating in an 

 unusual manner with both ischium and meros ; the superior 

 antennas are long and appendiculate, the inferior shorter ; the 

 mandibles are provided with an appendage ; the maxillipedes 

 possess squamiform processes ; the gnathopoda are non-sub- 

 chelate, and armed with long, close fringes of hairs ; the pos- 

 terior pleopoda are biramous ; and the telson is simple. 



Allied to Kroyer's genus Protomedeia, but distinguished 

 from it by the short exappendiculate superior antennas and the 

 simple anterior gnathopoda, is a new generic form which I 

 have named Haplocheira, represented by a species found in 

 Port Jackson. 



The genus Amphithoe is common on the Australian coast, 

 several of the species being found both in Port Jackson and 

 in Port Denison ; Podocerus also occurs in the former locality, 

 together with three species of Cyrtophium, and one (or perhaps 

 two) of Dana's remarkable aberrant genus Icilius. 



Among the Corophiida 1 ., a curious form obtained with the 

 dredge in Port Jackson appears to belong to the genus de- 



Ann. & Mag. N. Hist. Ser. 5. Vol. v. 3 



