REPORT ON THE AMPHIPODA. 879 



apex of the lower margin, third joint shorter and narrower, with long slender spines at 

 the lower apex ; flagellum of more than twenty-eight joints, the first longer than the 

 third joint of the peduncle and equal to the four following joints of the flagellum, 

 with five groups of setules on the under side ; the secondary flagellum of one short 

 narrow joint, almost rudimentary, as in Epimeria cornigera of Fahricius. Sars, on 

 the other hand, says, " secondary flagellum entirely wanting." 



Lower Antenna. — The peduncles and flagella longer than those of the upper 

 antennas ; first three joints short, distally emarginate, the gland-cone long and narrow ; 

 the third joint with slender spines at the lower apex ; the fourth joint ecpial in length 

 to the preceding three united, with spines on the lower margin ; the fifth shorter than 

 the fourth ; there are short hairs or spinules on various parts of the peduncle ; the 

 flagellum of fifty joints, or more, the first equal in length to four or five that come 

 next, the terminal joints slender, longer than the earlier except the first. 



Upper Lip broad and deep ; apical margin narrowed, in the slightest degree 

 emarginate and minutely furred. 



Mandibles. — The cutting plate narrow, slightly clasping the secondary plate, 

 its long edge divided into about nine teeth, of which the last four or five are 

 prominent ; the secondary plate on the left mandible with the oblique edge divided 

 into five teeth, of which the lowest is the most produced ; on the right mandible this 

 plate is slighter, has a much narrower distal edge, divided into one long tooth and 

 three minute denticles ; spine-row of some fifteen denticulate spines with some that are 

 shorter and smooth, or setiform and ciliated ; molar tubercle long, prominent, with a 

 ciliated ridge along the inner surface, the dentate crown very small ; there is a process 

 on the inner surface between the molar tubercle and the palp, which is set just over it ; 

 the second joint of the palp scarcely so long as the third, carrying several long slender 

 sjnnes mixed with some that are shorter along the inner margin, beginning below the 

 centre ; the third joint a little curved, with the inner margin less so than the outer, 

 fringed along the inner margin with numerous spines of different lengths, three of those 

 at the apex being strongly pectinate. 



Lower Lip. — The principal lobes widely dehiscent, each carrying at the apex a short 

 but dense row of blunt-headed cilia, the margins ciliated, a long dense row of cilia on the 

 surface within the inner margin ; the mandibular processes short, divergent. 



First Maxillae. — Inner plate short and broad, with nine plumose setae on the oblique 

 distal margin ; the outer plate broad, with eleven variously dentate spines on the 

 obliquely truncate distal margin, the inner part of which is ciliated ; the long curved 

 second joint of the palp reaches beyond the outer plate, and on its irregularly toothed 

 distal margin carries four spine-teeth, the outermost the longest, with four or five seta- 

 like spines on the surface within the distal margin. 



Second Maxillae. — Both plates broad, the inner shorter and rather broader than the 



