416 EEV. T. E. K. STEBBIXG ON AMPHIPODA FROM 



a little longer than the sixth, which narrows to the apex, formiBg no palm; finger small, 

 curved, with a sctule on the concave margin, near to the nail. The hand and finger 

 have a closely similar structure in both gnathopods and all five perceopods. 



Second gnathopods like the first, except that the fifth and sixth joints are more nearly 

 equal. Branchial vesicles narrow. 



First percBopods. Second and third joints as in the gnathopods ; fourth scarcely longer 

 than wide, narrow at the base, then widening to a lobe in front ; fifth joint a little shorter 

 and narrower, as broad as long, much shorter than the sixth. 



Second perccopjods like the first. 



Third perceopods. Second joint rounded oval, little longer than broad, the hinder 

 expansion broadly produced below the third joint ; fourth as broad as long, hind lobe well 

 expanded and produced downward ; fifth much narrower, a little longer than broad, 

 distally narrowed, shorter than sixth. 



Fourth perceopods like the third, but the second and fourth joints larger. 



Fifth perceopods. Second joint shorter than in the two preceding pairs, but even wider, 

 the great hind expansion having a somewhat three-sided margin ; the remaining joints 

 nearly as in the third ])air. 



First p)leopods. Peduncle twice as long as broad, with five or six coupling-spines; rami 

 with about ten joints, inner ramus the shortei-, with no cleft spines. 



Second pleopods. Peduncle nuich shorter, distally widened, so as to be fully as broad 

 as long, with five or six coupling-spines on the projection ; rami nearly as in first pair. 



Third pleopods. Peduncle very short, with a long narrow projection, carrying at its 

 apex three coupling-spines ; inner ramus minute, oval, unjointed, without setae ; outer 

 ramus normal, but with the divisions of the joints somewhat obscure. 



First iiropods. Peduncle longer than the straight inner, rather shorter than the curved 

 outer ramus. The rami with obtuse apices, the vis-ii-vis margins microscopically 

 pectinate, the others finely ciliate. 



Second tiropods much smaller than first, otherwise similar. 



Third tirojwds consisting of a small oval piece, nearly concealed by the telsou. A 

 minute setule projects from outer margin of the apex. 



Telson semi-oval, with narrow apex projecting beyond the third uropods. 



Length about a fifth of an inch, 5 mm. 



Sah. Australian waters. Specimens sent me from Watson's Pay, New South Wales, 

 by Mr. Thomas Whitelegge, who called attention to their peculiar appearance, and in 

 compliment to whom 1 have named the species. 



Pereionotus Bate and Westwood. 



1862. Pereionotus Bate and Westwood, British Sessile-eyed Crustacea, vol. i. part 5, p. 226. 



1862. „ Bate, Catalogue of the Ampiiipodous Crustacea in the British Museum, p. S"^. 



1863. Icriduiin Grube, Sitzungsberichte der Schles. Gesellsch. voni ISteii Februar 1863. 



1864. ,, Crube, Archiv fur Naturgeschichte, Jahrg. 30, Bd. i. p. 209. 



