AMPHIPODA — STEBBINO. 601 



third as long as the second, instead of half its length as in 

 Haswell's description. The flagellum is twenty-jointed, with a 

 four-jointed accessory. The second antennaa have the penultimate 

 joint of the peduncle the longest, the flagellum sevsn-jointed. 

 The eyes are oval, of moderate size. 



The third joint of the mandibular palp is a little shorter than 

 the second. The inner plate of the first niaxillte has only three 

 setse, as stated by Walker. 



In the flrst gnathopods the fifth joint is longer and rather 

 broader than the sixth, in this respect differing from Haswell's 

 figure, and also from the smaller member of the second gnatho- 

 pods, in which the sixth joint is longer and not narrower than 

 the fifth. 



The last three peraeopods have the second joint more expanded 

 above than below. The pleopods are very narrow. The flrst 

 uropods have the rami nearly equal ; they aie only a little 

 shorter than the peduncle. The rami of the second pair are 

 unequal both in length and breadth. The rami of the third pair 

 are longer than the peduncle, laminar, spinose, of equal length, 

 diffei'ing a little in breadth. 



The telson is scarcely longer than broad, the apices acute, wide 

 apart though slightly convergent. Within and beyond each 

 of these projects a long spine with an attendant spinule on its 

 inner side. Adjacent to the spinules are the apical points of a 

 round-ended cavity reaching about three-fifths of the telson's 

 length, which at nearly this level carries a spine on each lateral 

 margin, followed further down by two unequal setules. 



A second specimen, presumably a younger male, from the same 

 station, shows the second gnathopods not very unequal, the 

 larger member of the pair having the fifth joint not short and 

 cup-shaped, but much longer than broad. 



Locality. — Ofi" Wata Mooli, 54-59 fathoms. 



Genus ELASMOPUS, A. Costa. 



Elasmopus, Costa, Rend. Soc. Borbou., n.ser., ii., 1853, pp. 170, 



175. 

 Masmopus, Stebbing, Das Tierreich, xxi„ 1906, pp. 441, 732. 

 Elasmopus, Chevreux, Mem. Soc. Zool. Fr., xx., 1908, p. 483. 



Between 1901 and 1905 six species were added to this genus, 

 one by Chevreux, one by Walker and A. Scott, and four by 

 Walker, all mentioned but not described in " Das Tierreich." In 

 1908 Chevreux added the species E. minimus and E. spini- 

 dacii/lus. 



