OAMMARTDJi;, 231 



ago vcrj- short, throo-articulatt'd. liif'iTior antennas nearly hall' 

 shorter thaii the superior ; Hagellum not half as long as the pe- 

 duncle ; peduncle hardly as long as the peduncle of the superior 

 pair. Guathoi)oda subequal, small ; first pair the smaller ; pro- 

 poda little oblong, straight, truncate at apex, below very short, 

 pubescent : margins of propodos of second pair nearly parallel ; 

 dactylos very small. Three posterior pairs of pereiopoda a little 

 unequal ; setoo few, remote, rather long at the base of the ductylos. 

 " Length -i-o lines. 



" Hah. Sooloo Sea, from a small island off the harbour* of Soung, 

 among sea-weed floating off the shore." — Dana. 



12. Megamcera albida. (Plate XL. fig. 7.) 

 Gammarus albidus, Dana, U. S. Exphr. Exped. p. 948. pi. Go. f. 4. 



'' Female. — Coxee moderately large. A small spine or two on the 

 back of the first, second, and foia-th segments of the pleon. Supe- 

 rior antennae nearly three-fourths the length of the body ; pe- 

 duncle shorter than flageUum, second joint a little the longest ; 

 flagellum about twcnty-one-articulated. Inferior antennae very 

 slender, nearly half shorter than the superior ; flagellum shorter 

 than base, about eight-articulated. Gnathopoda subc(]ual ; pro- 

 poda quite small, oblong, apex somewhat rounded, rather densely 

 hirsute below and also on carpus : the second pair a little the longer; 

 dactylos small. Posterior pair of pereiopoda subequal ; setio nu- 

 merous, rather longer than the diameter of the propodos. 



" Male. — Second pair of gnathopoda stout ; propodos large, oblong, 

 narrower at base, the margins nearly parallel, lower margin with a 



- few very short setae, apex obliquely truncate, forming the palm ; 

 palm a little excavate, and defined below by an angle ; dactylos 

 half as long as the propodos. 



" Length 5 Hnes. 



" Hah. Tongatabu, in shallow waters of the lagoon, among sea- 

 weed." — Dana. 



13. MegamcEra Peniviensis. (Plate XL. fig. 8.) 



Gaiuniarus ? I'eruviensis, Dana, U. 8. Explor. Exped. p. 958. \i\. (in. 

 tig. 2. 



'* Body compressed. Coxaj large, the fifth much shoitcr ihaii the 

 fourth. Superior antenna) little shorter than the body, nearly 

 twice as long as the inferior pair ; peduncle shorter than the fla- 

 gf'lluiu, the three joints subeipud, the second somewhat the longest, 

 seta) short: inferior ])air hardly longer than prduia-le of Kui)eri(ir ; 



