NO. 1292. CJirSTA CEANS OF NICKA.TACK CA VE—IIA Y. 425 



))rcadth is at the last thoracic segment, and the greatest length, exclu- 

 sive of appendages, is about four times the greatest width. 



The head is considerably broader than long, concave in front, con- 

 vex on the sides, and with a small, indistinct lobe near the outer 

 posterior angle. 



The tirst body segment tits the head very closely, but the anterior 

 corners are slightly produced and the postei-ior portion of the lateral 

 border somewhat swollen, so as to leave a rather prominent sinus a 

 little in front of the middle of the l)order. The second segment is 

 more nearly straight along the anterior margin, has sharp anterior 

 and l)roadly rounded posterior angles. The third segment is quite 

 similar to the second. The fourth segment is still of the same gen- 

 eral character as the preceding, but is more nearly alike anteriorl}^ 

 and posteriorly than any of the other segments of the body. The 

 tifth, sixth, and seventh segments have their lateral expansions directed 

 backward, slightly in the tifth, and more strongly in the seventh. 



Behind the seventh segment can be seen two very small annular 

 segments of the abdomen. 



The telson is one-fourth longer than broad and about one-fourth 

 longer than the greatest width of the body. All its angles are ))roadly 

 rounded and its upper surface is only slightly convex. 



All the segments of the ])ody and the head and telson are thicklj- 

 covered with fine, short, bristle-like hairs, which project in every 

 direction. They are most evident about the margins of the body, but 

 may be found everywhere. 



The antennule is about as long as the peduncle of the antenna. The 

 basal segment is broad and somcAvhat enlarged distally. The second 

 segment is long, cylindrical; the third is shorter. The flagellum is 

 composed of 'al)out fifteen segments, all of which ])ear one or two 

 slender seta? at the distal border, and the outer seven or eight bear, 

 in addition, each a single spatulate sense organ. 



In the antenna the first two segments are short, the third slightly 

 longer than the first and second combined, and the fourth is as long- 

 as the first, second, and third taken together. The flagellum is very 

 long and slender, so that the entire antenna is fully as long as the 

 body. The mandildes have a cutting edge and a broad grinding sur- 

 face. The palpus is well developed and provided with a strong hand- 

 like extremity. 



The maxilhe and maxillipeds do not present characters of impor- 

 tance. 



The first pair of ambulatory legs (gnathopoda) are enlarged and 

 subch elate. The hand is broad, inflated, and convex; the dactyl is 

 strong and has an acuminate, somewhat sinuous, tip, and is provided, 

 especially along its opposable margin, with stifl' bristles. It shuts 

 against the hand Ijetween two rows of strong spike-like teeth. The 



