392 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [48] 



3fale. — The carapax is scarcely at all compressed laterally, and the 

 dorsal carina of the anterior half rises suddenly just back of the orbit 

 into a lamellar crest, which projects forward in a short, acute, and, as 

 seen from the side, triangular rostrum, reaching about three-fourths of 

 the way from the base to the tip of the eye-stalk, and armed above with 

 two sharp teeth, one at the highest point just over the orbit, and the 

 other nearly half way from it to the tip. 



The eye-stalks are about a third as long as the antenna! scales, slender, 

 strongly compressed vertically, with a small obtuse dentiform promi- 

 nence at the middle of the inner side, and just in front and outside 

 of this a small spot of black pigment, showing faintly on the ui)per, but 

 conspicuously on the lower side. The eyes themselves are scarcely 

 wider than the stalks, but are less compressed vertically, though still 

 much broader than high, distinctly faceted, and dark brown in the alco- 

 holic specimens. 



The liagella of the antennulae are imperfect iu all the specimens, but 

 both tiagella are longer than the antennal scale, and the proximal part 

 of the upper is considerably stouter than the lower. 



The antennal scale is about two-thirds as long as the carapax along 

 the dorsal line, about a third as broad as long, and only slightly nar- 

 rowed at the sharp tooth terminating the thickened outer margin, be- 

 yond which the anterior margin is oblique, so that the tip is toward the 

 inner edge, and much in front of the terminal tooth of the outer margin. 



The mandibles are almost exactly alike, somewhat contracted at the 

 crowns, which are small, and nearly as in Penceus. The proximal of the 

 two segments of the palpus is considerably the longer and broader, while 

 the distal is narrowly ovate, with the tip rounded. 



The proximal lobe of the [>rotognath of the first maxilla is small and 

 ovate, the distal lobe obliquely truncated and armed as iu the allied 

 genera. The endognath is narrow, carved, uusegmented, and shorter 

 than the distal lobe of the protognath. 



The three distal lobes of the protognath of the second maxilla increase 

 successively iu size distally, the distal being twice as wide as the next. 

 The endognath is much shorter than the distal lobe of the protognath, 

 and tapers regularly to the tip. The anterior part of the scaphognath 

 is much longer than the posterior and projects beyond the protognath, 

 while the posterior part is short, broadly expanded, and strongly in- 

 curved at the extremity. 



The protopod of the maxilliped projects anteriorly in a straight lobe 

 twice and a half as long as broad and rounded at the tip. The endopod 

 is composed of three very distinct segments : a narrow basal one reach- 

 ing a little by the protopod and with a slight expansion of the inner 

 edge armed with slender spines, while the rest of the inner margin and 

 the distal part of the outer are clothed with hairs ; a second segment 

 about half as long as the first, but expanded iu the middle so as to be 

 somewhat elliptical and nearly half as broad as long, with very long 



