1340 THE VOYAGE OF H.M.S. CHALLENGER. 



inner ramus it is the shorter arm that is shaped like the hand of a clock ; the joints of 

 the rami vary from five on the inner to seven on the outer ramus ; the pair of feathered 

 setse on each joint are stout. 



Uropods. — Peduncles of the first pair scarcely as long as those of the second and 

 much narrower, longer than the rami ; the outer ramus much shorter and narrower than 

 the inner, almost completely smooth-edged, acute like the rest of the rami ; inner ramus 

 nearly smooth on the inner margin, the outer margin pectinate with thirty or forty very 

 long slender spine-like teeth, and near the apex cut into some strong downward pointing 

 teeth ; peduncles of the second pair longer than the rami ; the outer ramus shorter than 

 the inner, longer than the outer of the first pair, its outer margin nearly smooth, its 

 inner serrate, less and less closely as it approaches the apex ; the inner ramus broadly 

 lanceolate, with both margins denticulate, the outer more closely than the inner ; 

 the peduncles of the third pair as long and broad as those of the second, the 

 rami equal in length, not as in the other pairs more, but less, than half the 

 length of the peduncles ; the outer ramus with the outer margin almost smooth, 

 the inner denticulate ; the inner ramus having eight teeth or serratures on its nearly 

 straight inner margin, and nine or ten stronger teeth on the outer, the proximal 

 part of which is straight and smooth ; the peduncles of the second and third pairs have 

 the under surface grooved for a short distance from the base backwards. 



Telson very small, distally rounded, apparently rather tumid and very thin-walled. 



Female. 



Upper Antennas. — First joint cylindrical, rather longer than broad, second about a 

 fourth the length of the first, narrowing towards the still shorter third joint; the flagellum 

 not quite so broad as the peduncle, but twice as long, with convex margins tapering to 

 an outdrawn point, the inner margin fringed with groups of filaments. 



Lower Antennas shorter than the terminal joint of the upper; the gland-cone is 

 observable on the inner side of the antennae, but coalesced with the wall of the head; the 

 third (first free) joint is tapering, followed by a minute terminal joint. 



Marsupial Plates much larger than the branchial vesicles, without setae; a large pair 

 attached to each of the first three pairs of peraeopods and a small pair to the second 

 gnathopods. 



Pleopods. — The peduncles rather more slender than in the male. 



Length of the male specimen, in the position figured, from the front of the head to 

 the extremity of the uropods, three-tenths of an inch; fully extended, the length would be 

 about four-tenths. 



Locality. — July 1875; between Japan and Honolulu, lat. 35° N.; surface. Seven 

 specimens, male and female. 



