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traced out. A mesogastric area, from which a median sulcus passes forward to the front, is 

 distinctly outlined, a cardiac region, flanked by a prominence at either side, is seen behind, 

 while hepatic and branchial regions are not clearly separated one from another, but studded 

 with rather few, scattered granules ; most conspicuous, however, and even clearly 

 standing out from the fur, are two obliquely directed, but straight, oblong 

 prominences or thick ridges, one on each protogastric region, pointing 

 outward in the direction of the external orbital angle, but clearly cut off 

 on all sides; it are these ridges which induced me to designate the new species bicristata. 

 The various regions of the carapace are slighdy bulging, but on the whole the surface 

 is rather flattened in both main directions, only rapidly falling off on the front, which is verti- 

 cally deflexed, beyond the transverse row of slender, club-like hairs; there are some few large 

 granules between this row of hairs and the protogastric ridges; the anterior margin is somewhat 

 produced in the middle and slightly notched, the lateral angles are rectangular, not smoothly 

 rounded off, and pass with a deeply-concave curve into the somewhat raised inner orbital 

 margins, that are separated off from the surface of the front by a shallow, obHque sulcus. The 

 breadth of the front is more than twice the width of the small orbit, the supra-orbital border 

 of which is entire, transverse, and provided with a slight prominence, near, and exactly similar 

 to, the blunt external orbital angle, directed forward and little prominent. The eye-stalk is 

 short, piriform, its dorsal surface is thickly clothed with club-like hairs, and the small eye, 

 with intensely-black pigment, is situated chiefly on the ventral side. The lateral margins of the 

 carapace are regularly and not very greatly curved, the breadth of the carapace, however, is 

 enlarged by strong, lobe-like, somewhat flattened teeth, numbering five in 

 all behind each external angle of the orbit and extending to the level of 

 the penultimate pair of legs; these teeth are projecting somewhat beyond the thick 

 fur of the margins of the carapace, but it is only after removal of these hairs that the exact 

 shape of the lateral teeth may be clearly made out : the first of these teeth is separated by a 

 deep notch from the outer angle of the orbit, the second and third are the largest, separated 

 by a rather wide interspace, the second presents a tubercle on its hind margin and is blunt, 

 directed outward, the third exhibits the same shape, but is slightly smaller, more flattened, its 

 plane being oblique to that of the carapace, the fourth is situated close to the preceding, is 

 smaller and still more ridge-like in dorsal view of the carapace, the fifth tooth finally is placed 

 far back, just before the level of the bases of the penultimate pair of legs, and of a semi- 

 circular, flattened shape. Along the margins the surface of the carapace is entirely smooth 

 (beneath the hairs) and much flattened, rising abruptly, with a steep slope, towards the elevated 

 and granulated branchial regions. The hind margin of the carapace is convex and somewhat 

 thickened. 



Antennulae folded somewhat obliquely beneath the front, separated by a very narrow 

 septum. Antennae about \^\„ times as long as the width of the orbit; basal joint of the peduncle 

 as long as the two following together and firmly fixed between the lateral angle of the front 

 and the inner orbital angle, which is not prominent. Epistome distinct, strongly folded transversely, 

 with the hind margin nearly vertical, much wavy. Lateral margins of buccal cavity somewhat 



49 



26 



SIBOGA-EXPEDITIE XXXIX c"'. 



