520 



THE VOYAGE OF H.M.S. CHALLENGED. 



Peduncle of the first pair of antennae scarcely more than half the length of the 

 rostrum. 



Second pair of antennas having the scaphocerite ovate and not longer than the 

 peduncle of the first pair. The other appendages are without important differential 

 characters. Telson longer than the outer rami of the rhipidura. 



Habitat,— Station 232, May 12, 1875 ; lat. 35° 11' N., long. 139° 28' E.; Hyalonema- 

 ground, off Japan; depth, 345 fathoms; bottom, green mud; bottom temperature, 41° - 1. 

 One specimen, female. Trawl and dredge both used. 



This species has the surface covered with a short fur, but is otherwise smooth between 

 the several carinas on the carapace. 



The rostrum is long, nearly equal to the length of the carapace, measured from the 

 orbit to the posterior margin. All the carinas, which comprise the usual number, eight, 

 are free from denticulations except the two dorsal, which show slight indications of 

 denticular marking. 



The surface of the pleon is comparatively smooth, but a lateral light on a dry specimen 

 renders markings visible that correspond with the corrugations on other species. 



The ophthalmopoda are round and of moderate dimensions. 



The first pair of antennas has the peduncle scarcely more than half the length of the 

 rostrum, but this difference is due to the length of the rostrum rather than to the short- 

 ness of the antennas. 



The second pair has the scaphocerite rather ovate than circular, and possesses no 

 trace of a tooth on the outer margin. 



The other appendages show no specific character, except that the dactylos of the 

 posterior pair (fig. 5o) is long, laterally compressed and lanceolate, the distal extremity 

 of the propodos being furnished with a fringe of long hairs. 



The first somite of the pleon Las the dorsal surface armed with three long anteriorly 

 directed teeth, the central forms the anterior extremity of the median carina and extends 



