490 



CRUSTACEA. 



Carapax anteriorly narrow, and, as seen from above, rather strongly 

 bilobate, behind the eyes hardly salient, sides posteriorly somewhat 

 divergent. Anterior feet small, hand oblong, naked or nearly so. 

 Six following legs naked or nearly so. Tarsus with five spines 

 and a seta, and at base a tubercle like a heel to the tarsus ; pos- 

 terior pair smaller, tarsus small, not spinous below, but having two 

 pairs of short setules or hairs, at apex unguiculate and armed with 

 three long setae. 



Plate 31, fig. 3 a, animal, enlarged four diameters; b, outer an- 

 tennae, enlarged; c, tarsus of third pair; d, ibid, of fifth pair; e, part 

 of one of the setse of posterior tarsus ; /, hand ; g, front view of beak. 



Atlantic, lat., 8i° south; long., 26° west. Collected on the 9th of 

 November, 1838, at 4 A. m. 



Length of carapax, three lines. Body, nearly transparent ; faint 

 reddish colour in the legs, and finely dotted^with brown. The cara- 

 pax is narrow in front, with the margin a little sinuous posterior to the 

 eyes. The hand is smooth, quite broad and compressed, the part ante- 

 rior to the fingers being hardly as long as its height. The carpus has a 

 spine on the inner margin. Of the setse at the extremity of the poste- 

 rior tarsi, two are in part serrate, as in figure 3 e, while the other is sim- 

 ply setulose. The tarsi of the second, third, and fourth pairs of legs, 

 instead of having 'seven spines below, like the elegans or spinitarsus, 

 have a tubercle at base, in place of the first spine, and a seta in place 

 of the second. The spines, as stated, are prolongations of the shell, 

 and thus differ widely from hairs or setse. Caudal appendages reach 

 a little beyond extremity of abdomen ; plates oval and edged with 

 plumose hairs. 



Marestia pervalida. 



Carapax antice lotus, et superne visits obsolete quadrilobatus, lobis sub- 

 asquis, lateribus postice non diver gentibus, propeque medium uniden- 

 tatis. Pedes antici pervalidi, manu crassd, tumidd. Tarsi postici 

 infra spinosi, apice setis tribus instructi, 



Carapax anteriorly broad, and as seen in a vertical view obsoletely 



