63 



distinct in its central part, but becomes obscure at the sides. 



The sternum becomes very narrow anteriorly, and is furnished 

 with two or three large spines at the base of the chelipeds. It 

 is divided by three deep, transverse furrows. The sternal plates 

 of the last thoracic segment are atrophied, being represented 

 merely by a patch at the base of each of the fifth pereiopods. 

 The linea anomurica is distinct, and is deepest in its posterior 

 part. Below it the flanks of the carapace bear a number of 

 small, irregularly -arranged spines. 



The first tvvo abdominal terga bear a transverse row of spines, 

 some of which are much larger than others. The first abdominal 

 segment is very narrow and its pleura are rudimentary. All 

 the other segments are much broader and have well-developed 

 pleura ; the latter are largest and most sharply pointed in the 

 second segmiCnt, and become successively smaller and blunter 

 backwards. The third, fourth, and fifth terga are practically 

 smooth ; the sixth tergum, however, bears about a dozen spines 

 arranged in two roughly crescentic rows, in addition to three 

 on the posterior margin, which are pressed against the under 

 surface of the thorax. 



The terga bear very short setae on the smooth parts of their 

 surface. The anterior edges of the pleura are furnished with 

 setae, and in the second segment bear a few small teeth. 



The telson and uropods are completely folded under the last 

 part of the abdomen, which in its turn is berbt on itself, so that 

 the end of the sixth segment is pressed against the thoracic 

 sternum. The telson is quite thin and membraneous ; it is 

 slightly concave laterally and posteriorly, and is divided by 

 a transverse suture. 



The eyes reach the middle of the rostrum. The corneal part 

 is wider than the cylindrical stalk. 



The antennular peduncle extends well past the tip of the 

 rostrum. The basal joint is thicker than the second and third ; 

 the opening of the otolith -chamber is elevated into a ridge 

 fringed with bristles. The third joint is the longest ; it is very 

 slightly thickened distally. The internal flagellum is thick at 

 the base, but tapers rapidly to a fine point ; it is composed of 

 about twenty joints and bears a heavy fringe of hairs. The outer 

 flagellum is much shorter, is quite slender throughout, and is 

 composed of very few joints. 



The antennal peduncle is very slender and quite short ; it 

 extends just beyond the cornea of the eye. The flagellum is 

 also short, being very slightly longer than the antennules. The 

 peduncle is five- jointed and has a rudimentary scale. There is 

 a slender spine at the distal end of the terminal joint. 



The mandibles have a well developed three-jointed palp. 

 The anterior four or five teeth on the cutting edge are much 

 larger than those behind. 



The exopodite of the first maxillae is represented by a mere 

 rudiment ; at the tip of the endopodite there are three or four 

 sharp spines. 



