24S AMi'niroDA normalia. 



a little shorter than base. Both pairs of gnathopoda having the 

 propoda quite small and nearly equal, oblong, arcuate below ; 

 dactyla minute. First and second pairs of pcreiopoda subeq\ial, 

 not shorter than the second pair of gnathopoda ; basa very broad : 

 i-omaining three pairs rather short, increasing slightly in length 

 from the third to the fifth, setso minute ; basa broad. 

 *' Length 3 lines. 



" I{f(b. Among the roots of floating fucus (Macrocystis), at sea, 

 thirty miles south-west of Valparaiso." — Dana. 



30. AmpMthoe brevipes. (Plate XLIII. fig. 2.) 

 Amphithoe brevipes, Dana, U. S. Exphr. Exped. p. 941. pi. 64. f. 5. 



" Female. — Body compressed. Coxae broad, the fifth paii' subquadrate. 

 Eyes round. Superior antenna? about half as long as the body, fii'st 

 joint longest ; flagellum more than twice as long as base, nearly 

 naked, setae hardly longer than breadth of joint. Inferior antennae 

 half shorter than the superior, base longer than in superior, third 

 and fourth joints subequal ; flagellum miich shorter than base, 

 hirsute. Gnathopoda subequal, having the propoda quite small, 

 subrectangular, ajjex truncate, dactj'la minute. First and second 

 pairs of pereiopoda with the basa quite broad, the fourth and 

 fifth gradually increasing in length. 



" Male. — Second paii' of gnathopoda having the propodos large, sub- 

 ovate, arcuate above, below [palm] nearly straight, with a few 

 setae, and near the apex a minute acute tooth ; dactylos long. 



" Hah. Near Hermit Island, Tierra del Fuego ; brought up with 

 kelp, in 5 fathoms water, by Lieutenant Case, January 27, 1S39." — 

 Dana. 



31. Amphithoe Brasiliensis. (Plate XLIII. fig. 3.) 

 Ainphithoe Brasiliensis, Dana, U. S. Exphr. Exped. p. 943. pi, 64. f. 6. 

 " Near A. Tongensls. Body compressed. Coxae large. Superior an- 

 tennae much longer than half the body, flagellum very long and 

 slender, setae quite short. Inferior antennae a little shorter than 

 the superior, hirsute ; base hardly shorter than flagellum ; articuli 

 of flagellum towards the base slightly oblong, setae of lower side 

 more than twice as long as those above. Gnathopoda subequal : 

 fii'st pair the smaller, slightly arcuate above, rounded below, and 

 hirsute ; palm obli(|uo-transverse ; dactylos half as long as pro- 

 podos : proi:)odos of second pair of moderate size, more hirsute than 

 that of first pair, oblique -transverse at apex; palm hardly excavate, 

 long-hirsute, acute at the lower limit ; carpus broad, produced be- 



