MEGALOPIDEA. 4gg 



Anterior feet rather small, hand oblong, with a few remote cilise on 

 lower side. Feet of second pair sparsely ciiiate along the margins, 

 tarsus below with seven spines, and without a tubercle at base. 

 Posterior feet shorter, tarsus with six spines below, apex unguicu- 

 late and furnished also with four longish setae. 



Plate 31, fig. 2 a, animal, enlarged four diameters; b, front view of 

 front; c, outer antennae; d, second maxilliped; e, third or outer 

 maxilliped ; /, hand ; g, same, with fingers closed ; h, tarsus of third 

 pair of legs; i, tarsus of fifth pair. 



Off Cape of Good Hope, abundant. 



Length of carapax, four to five lines. Carapax, translucent and 

 smoky brown within ; surface, spotted with bright blue, and legs the 

 same ; abdominal segments, brown, with a row of largish blue spots 

 near posterior margin; last segment, colourless; eyes, blue-black 

 within, with a greenish reflection. Arm and carpus unarmed. 



Krauss mentions that the Megalopa mutica was found by him at 

 the Cape of Good Hope ; and we have suspected that the above may 

 be the species he obtained. The mutica is figured by Desmarest 

 without the setae of the posterior tarsi, and more recently in the same 

 manner by Edwards, in Cuvier's Animal Kingdom ; and moreover, it 

 has the lobes of the front more projecting. It differs from the spini- 

 tarsus of Say, in having four instead of three terminal setae to the 

 posterior tarsi, and from the atlantica, in having the posterior tarsi 

 spinous below, like the preceding, — in the number of set3e, being four 

 instead of three, — and the spines of the other tarsi, seven in number, 

 without a basal tubercle. 



Marestia atlantica. 



Carapax antice angustus et superne visits bilobatus, pone oculos vix saliens, 

 lateribus postice parce diver gentibus. Pedes antici parvi, manu ob- 

 longd, nudd out nudiusculd. Pedes 6 sequentes nudiusculi, tarso infra 

 5-spinoso, ad basin tuberculum instar calcis infra gerente. Pedes 

 postici minores, tarso parvulo, infra non spinoso sed setularum brevium 

 paribus duabus instructo, apice unguiculato et setis tribus armato. 



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