278 THE VOYAGE OF H.M.S. CHALLENGER. 



sixth. Telsou half the length of the rhipidura, truncated between two prominent teeth ; 

 dorsal surface depressed. 



The ophthalmopod does not reach to the extremity of the rostrum. The ophthalmus 

 is orbicular. The first pair of antennae has the first joint a little longer than the ophthal- 

 mopod, and carries on the inner side a prosartema that is as long as the joint, and on the 

 outer side a stylocerite that is half the length, and a strong tooth at the outer distal 

 angle. The second joint is nearly as long as the first, but the third is shorter and 

 terminates in two subequally long, but unequally stout flagella, the length of which is 

 rather more than that of the carapace. The second pair of antennas carries a scapho- 

 cerite that reaches beyond the extremity of the peduncle of the first pair, bearing a tooth 

 near the apex, and terminates in a slender flagelhim that is about three times the length of 

 the entire animal. The pereiopoda generally are short, except the posterior pair, which 

 is long. The pleopoda are not remarkable for their length, and, excepting the first, are 

 biramose. The posterior pair, which forms part of the rhipidura, has the inner branch 

 ovate and the outer with its apex at the outer margin, where it terminates in a small tooth. 



Length (female), 100 mm. (4 in.). 



Habitat.— Station 192, September 26, 1874 ; kit, 5° 49' 15" S., long. 132° 14' 15" K; 

 off the Ki Islands, south of Papua; depth, 140 fathoms; bottom, blue mud. One 

 specimen was trawled ; female. 



The rostrum is short and horizontal, with the under margin curved upwards at the 

 apex ; upper margin armed with seven subequidistant teeth, the spaces between them 

 gradually increasing posteriorly, the last tooth standing behind the gastric region. The 

 frontal margin is armed with an antenna! tooth and one immediately behind it, There 

 is also one on the hepatic region and one submarginal in advance of it below. 



The pleon is compressed from the third somite posteriorly, and is dorsally furnished 

 with a distinct and continuous carina from the third to the posterior extremity of the 

 sixth somite, where it terminates in a small tooth. 



The telson is half the length of the outer ramus of the rhipidura, and is dorsally 

 grooved. It is terminally truncated and armed on each side with a long slender tooth. 



The ophthalmopod is Inarticulate, shorter than the rostrum, and terminates in an 

 orbicular ophthalmus ; the somite that supports it is exposed and movable. 



The first pair of antennas has the first joint as long as the rostrum, armed on the 

 outer side with a short stylocerite, and at the distal angle with a long and slender tooth, 

 and bearing on the inner side a prosartema copiously fringed with hairs ; the second joint 

 is nearly as long as the first, and the third is short and cylindrical, and supports two 

 flagella, one more slender than the other and both longer than the carapace. The lower 

 and more robust branch is longitudinally compressed, but not excavate as in Solenocera, 

 in which the more slender flagellum when at rest lies imbedded in a groove in the larger. 



