916 CRUSTACEA. 



claw, not longer than one-third of the fifth joint; this joint oblong, 

 narrower at apex, setae not more than half as long as the joint. 

 Feet of second pair ending in a spatulate joint, which is rounded at 

 apex and has an obsolescent claw at middle of apical margin. Third 

 and fourth pairs of feet setose below, the setae rather long; six 

 posterior pairs gradually increase in length, the fifth joint of seventh 

 pair slender, with the setse hardly half the diameter of the joint in 

 length. 



Plate 62, fig. 2 a, animal, much enlarged ; b, head (in which t is a 

 keel on the front; m 3 , maxilliped; _p, extremity of the anterior legs) ; 

 c, posterior stylets and extremity of abdomen, in profile ; d, e, mandi- 

 ble, in different positions ; /, maxilla of first pair ; g, ibid, of second 

 pair ; h, part of leg of first pair ; i, ibid, of second pair ; k, ibid, of third 

 pair ; I, ibid, of fifth ; w, ibid, of seventh pair. 



Rio Janeiro, Brazil. 



Length of body, five lines. The fifth epimeral is about half as long 

 as the fourth. The second joint of the superior antennae is fully as 

 long as broad, and stouter and longer than third ; the appendage has 

 the three joints oblong, and not very short as in the brasiliensls ; it is 

 nearly two-thirds as long as the flagellum. The flagellum of the an- 

 tennae consists of six or seven similar joints, which are nearly twice 

 as long as broad. The epistome has a keeled projection which is very 

 prominent, projecting obliquely upward with the extremity horizon- 

 tally truncate (see fig. 2 b) . The mandible has a subcorneal extremity, 

 of a dark colour, which consists of a single tooth and one smaller on 

 the side ; behind this narrow part there is another small rounded pro- 

 cess, which is also dark-coloured. Below the extremity there is a 

 narrow line or crest of setae; just below them is a small promi- 

 nence, answering to the molar process, although imperfectly, of this 

 character. The palpus is three-jointed, with very few setae, and 

 these apical; the inner surface of the last joint is minutely short 

 hairy, as seen under a high magnifying power. The palpus of 

 the inner maxillae is dentate at summit, and but faintly two-jointed. 

 The fifth joint of the first pair of legs is slightly longer than the 

 fourth; the fifth joint of the second pair has stoutish setae below, 

 which increase in length to the subapical; on the upper side there is a 



