121 



The second and third pairs of external maxillipeds pediform, elongate; 

 the three terminal joints of the second pair thickened, bent backward ; 

 the third pair very long, exceeding the length of the thoracic feet, and 

 extending anteriorly to about the apex of the inner antennary peduncle. 

 The maxillipeds, and the six anterior thoracic feet, furnished with loug, 

 simple setae. The fourth and fiftb pairs of thoracic feet slenderer than 

 the preceding, cylindrical, more sparsely furnished with setae; setai 

 plumulose; dactylus flattened, subovate; fifth pair shorter than the 

 fourth ; fourth almost as long as the carapace. Abdominal feet long and 

 narrow; first pair nearly as loug as the carapace; the length of the 

 peduncle almost equals the length of the rami ; the length of the feet 

 decreases posteriorly, while the diameter of the peduncle increases; the 

 margins of the rami densely covered with long, plumulose cilia. Abdo- 

 men longer than the cephalothorax ; the five anterior segments subequal ; 

 the sixth long, equals the lengths of the fourth and fifth combined: fifth 

 unarmed above ; the posterior margin of the sixth, above and below, 

 acute; inferior border furnished with long, plumulose cilia. The external 

 margin of the outer caudal lamella armed with an aculeate spine near 

 the posterior extremity. The margins of all the caudal appendages, 

 except the external margin of the outer lamella anterior to the spine, 

 furnished with long, equidistant, feathery cilia. 



A comparison of the above description with that given by Stimpsou 

 shows that they agree in every particular, except in the length of the 

 eyes — which he distinctly states reaches to the apex of the penultimate 

 article of the antennary peduncle — and in the character of the front. 

 Concerning the latter, he says, " rostrum minutely spinous, acute, curved, 

 dorsum armed with a tooth or spine." Neither the spine nor the spini- 

 form rostrum, are observable in the present specimen. The eyes were 

 somewhat shrunken, and the front was probably mutilated in the sur- 

 face tow-net in which the animal was caught. When the author states 

 that the sjrtnes are minute, in a specimen only a half an inch long that 

 requires a microscope to examine any part of its structure, they must 

 be exceedingly small, and are very apt to be broken off by the rush of 

 the water through the net. If these differences are found to be constant, 

 this will constitute a distinct species; but I am not willing to found it 

 upon the examination of a single specimen. 



Locality: North Pacific Ocean. 



Caught June 28, 1873, in latitude 30° north, longitde 145° west. 



