230 AMPniPODA rrORMALIA. 



dorsal surface of each segment. Eyes ovate, imperfect. Superior 

 antennrp longer than the inferior ; flagelhim rather longer than the 

 peduncle. Inferior antenna) having the peduncle as long as the 

 peduncle of the superior. Gnathopoda of the same form : second 

 pair larger than the first ; propodos ovate, palm oblique, straight, 

 fiinged with cilia. Pereiopoda long and slender. Posterior pair of 

 pleopoda longer than the preceding, rami subequal. Telson having 

 a solitaiy subapical spine upon the inner edge of each division. 

 Length ^ths of an inch. 



Hah. "Wellington Channel, 35 fathoms {Sir Edward Belcher). 



I have been enabled to describe this species through the kindness 

 of Professor Bell, who entrusted me with the collection made by Sir 

 Edwai'd Belcher, and described by him in the Appendix to Belcher's 

 ' Last of the Arctic Voyages.' 



10. Megamcera aspera. (Plate XL. fig. 5.) 

 Gammarus asper, Dana, U. S. Exjilor. JSxped. p. 94o. pi. 65. f. 2. 



" Body rather stout. Coxae broad, the fifth slightly shorter than the 

 fourth. Segments of the pleon unequally denticulate on the pos- 

 terior margin. Eyes subrotund. Antenna) having the peduncles 

 long, subequal, and the articuli of the flagella oblong, the setae not 

 shorter than the articuli : superior paii" with the first joint of the 

 peduncle quite stout, the second slender, nearly twice as long as the 

 first, the third much shorter ; secondary appendage three -jointed. 

 Inferior antennae about half as long as the body ; peduncle very 

 slender, the last two joints subequal ; flagellum a little shorter 

 than the peduncle. First pair of gnathopoda veiy small ; propodos 

 minute, oblong, attenuate : second paii- more than twice the length 

 of the first, densely hirsute below ; propodos oblong, margins 

 nearly parallel, palm very oblique ; dactylos half the leng-th of the 

 propodos ; carpus shorter than the propodos. 



" Length 6 lines. 



"Dredged up in 6| fathoms. Sooloo Ai'chipelago, February 2, 

 1842."— Dr/Hrt. 



11. Megamcera Suluensis. (Plate XL. fig. 6.) 



Gammarus Suluensis, Dana, U. S. Explor. Exped. p. 947. pi. 65. f. 3. 



" Body rather stoiit. First and second segments of the pleon having 

 the posterior margin on the back two- to three-dentate, fourth 

 also two-acute [dentate ?]. Eyes subrotund. Superior antennae 

 as long as the body ; flagellum longer than the peduncle, its arti- 

 cxili oblong, the setae as long as the articuli ; secondary append- 



