336 ON SOME NEW GENERA AND SPECIES OF AMPHIPODA, 



■pereion and first two segments of the pleon ; (2) in the direction 

 of the palm of the posterior gnathopoda, which is almost transverse. 

 Length 3/10thsin. 



Ilab. Sue Island, Torres Straits (Chevert Exped.). 



Megamoera Bceckii, sp. nov. (PL XXI., fig. 6.) 



Eyes oblong. Superior antennae nearly as long as the cephalon 

 and pereion ; first two segments of the peduncle nearly equal in 

 length, third small ; flagellum longer than the peduncle ; 

 appendage composed of four elongated aiticuli. Inferior antenna) 

 scarcely two-thirds of the length of the superior pair; the flagellum 

 a little longer than the last segment of the peduncle. Anterior 

 gnathopoda with the propodos ovate, palm undefined, hairy. 

 Posterior gnathopoda having the carpus subtriangular ; the 

 propodos ovate, twice as long as broad, twice as long as that of 

 the anterior pair, the palm oblique, slightly excavate, with four 

 small teeth ; the dactylos rather more than one-third of the length 

 of the propodos. Posterior three pairs of pereiopoda rather stout, 

 serrated and bordered with setse. Eami of posterior pleopoda 

 short and broad, truncate, serrated and setiferous. Length 

 3/20ths in. 



Hah. Clark Island, Port Jackson. 



Grenus Wyvillea (novum). 



Coxse scarcely so deep as their respective segments. Superior 

 antennae shorter than the inferior pair, appendiculate. Mandibles 

 with an appendage. Maxillipedes exunguiculate, squamiform 

 processes rudimentary. Gnathopoda subchelate, posterior pair 

 very large. Posterior pleopoda uniramous — the ramus large. 

 Telson simple, undivided. 



I have named this genus in honour of Prof. Sir C. AVyville 

 Thomson. 



