420 DE. J. G. DE MAN ON CEUSTACEA CHIEFLY 



terminates in a sharp tooth and carries two spinules on either side, of which the inner 

 are twice as long as the outer. 



The 6} e-peduncles, which present a distinct ocellus near the cornea, project almost 

 entirely beyond the antero-latera] angle of the carapace, when directed transversely 

 outward, and reach to the distal fifth of the first joint of the antennular peduncle. 



The inner antennae barely reach with their thin filiform, inner flagellum beyond the 

 end of the autennal scales. The first joint of the peduncle, which is not quite half as 

 long as the antennal scales, is three times as long as the second ; the pointed stylocerite, 

 the outer margin of which is straight, extends barely beyond the distal end of the first 

 joint. The second joint, the outer border of which terminates dis tally in a small sharp 

 tooth or spine, appears once and a half as long as broad when viewed from above, and 

 twice as long as the third joint, which has also a small sharp tooth at the distal end. 

 The shorter outer flagellum is considerably thickened along two-thirds of its lengtli and 

 beset with olfactory sette. 



The basal joint of the peduncle of the outer antennae carries a small spine at the 

 distal border of its lower surface. The blade of the scale, which is five times as long as 

 broad, and the outer margin of which is straight, exceeds the small spine considerably 

 by its rounded antero-internal angle. The peduncle reaches nearly to the distal end of 

 the second joint of that of the inner antenna?, and the flagellum is about as long as the 

 abdomen. 



The mandibles are typical, and consist of a strong molar-process, an incisor-process, and 

 a palp. The molar-process carries at the distal end a subacute conical tooth and another 

 that is more obtuse ; the distal end is yellow-coloured and thickly covered with short setulaj 

 or bristles. The incisor-process, almost as long as the molar-process, but much narrower, 

 tooth-like, narrows somewhat towards the distal extremity, which is divided into four 

 acute teeth, the outer one of which is a little larger tlian the three others, which are of 

 equal size ; both processes are not connected and make a right angle with one another. 

 The palp that originates at the base of the incisor-process is two-jointed ; the terminal 

 joint, as long as the otlier, is 0"45 mm. long, spathulate; its margins are fringed with 

 pubescent setae, a few of which occur also on the basal joint. 



The external maxillipeds are short, reaching only to the distal end of the antennal 

 peduncle, and are devoid of an exopodite ; the antepenultimate joint is deeply hollowed 

 out along the proximal half of its lower surface, and the penultimate is half as long 

 as the terminal joint, which is armed with six sharp teeth at the distal end. 



The legs of the first pair are very short, reaching only to the distal end of the basal 

 joint of the antennal peduncle. Tlie carpus, which slightly thickens distally, is a little 

 shorter than the merus and than the chela ; the fingers are about half as long as tiie 

 palm; the dactylus terminates in two dariv-brown claws, the fixed finger in one. Tlie 

 second legs (PI. 32. fig. 48) barely reach beyond the antennal peduncle. The seven 

 joints of tlie carpus, which is 4*24 mm. long, not yet twice as long as the merus, are, 

 from the proximal to the distal end, respectively 0-65 mm., 0-38 mm,, 1-02 mm., 07 mm., 

 0-5 mm., 0-34 mm., and 065 mm. long ; the chela is 1'22 mm. long, the fingers 0-52 mm. 

 These numbers show that the first and the seventh joints are equally long, that the 



