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



Fifth Peneopods missing. 



Plcopods. — Coupling spines not observed, cleft spine single ; joints of the rami 

 numbering about five or six. 



Uropods. — The relative dimensions of the first and second pairs much as in the two 

 preceding species. The third pair missing. 



T/ie Telson appeared to be rather shorter in proportion to its length than in the 

 preceding species. 



Length. — The specimen, in the (curled) position figured, measured, in a straight line 

 from the rostrum to the back of the third pleon-segment, one-tenth of an inch. 



ZocaZi^i/.— Station 186, in Flinders Passage; lat. 10° 30' S., long. 142° 18' E.; 

 depth, 7 to 8 fathoms ; bottom, coral mud. One specimen. 



Remarks. — The specific name refers to the place of capture. 



Between this species and Leucothoe hrevidigitata, Miers,' the following diff'erences 

 may be noticed. Mr. Miers' specimen, obtained at Thursday Island, was very much 

 larger, "length about 7^ lines (16 millim.)" ; the flagellum of the upper antennae 

 was thirteen or fourteen jointed ; the first gnathopods " have their basus joints 

 moderately dilated, with the posterior margins thin-edged and hairy ;" the front 

 margin of the wrist is much longer, to judge by the figure, than in the Challenger 

 species ; in the second gnathopods the carpus is said to be " very short, and produced 

 along the posterior margin of the propus for less than half its length," while the figure 

 shows the palm of the hand very long and concave instead of convex ; nothing is said 

 of the fringe of sette on the front margin of the first joint and hind margin of the 

 wrist of the first gnathopods, which are very noticeable features in Leucothoe Jlinderst, 

 nor is mention made of the long cylinders on the flagellum of the upper antennae. 

 Nevertheless the possibility remains that the specimen here described may be only the 

 5^oung form of Leucothoe hrevidigitata. 



Genus Seha, Costa. 



(1) Sfha, Costa (1). 

 1862. „ Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 159. 

 1875. „ Stebbing, Ann. and Mag. Nat. Hist., ser. 4, vol. xv. p. 2. 



1884. Teraticum, Chilton, Trans. New Zealand Inst., vol. xvi. p. 257. 



1885. Seba, Chilton, New Zealand Journ. Sci., vol. ii. p. 320. 



The original authority for this genus has thus far eluded my researches. For a 

 definition, apparently translated from a memoir by A. Costa, see Note on Spence Bate, 

 1862 (p. 334). For a second, independent definition, see Note on Chilton, 1884 (p. 550). 

 The genus makes some approach to Ijeucothoii in the proportions of the mandibular 



I " Alert" Report, p. 313, pi. xxxiv. fis A, 1884. 



