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



twice as long as broad — as long as the two preceding abdominal segments of the female — 

 and hear five seta', which are shorter than the abdomen, except the fourth (counting from 

 the outside) of the left stylet, which is about twice as long as the whole body of the 

 animal. The spermatophores (fig. 12) are very large, and are attached singly ; the 

 contained spermatozoids (fig. 13) are also of unusual magnitude. 



Habitat.— Torres Straits (Station 185); lat. 40° 3'S., long. 132° 58' W. (Station 288); 

 hit. 36° 44' S., long. 46° 16' W., 2650 fathoms (Station 325); lat. 37° 45' S., long. 33° 

 0' W. (Station 330); lat, 7° 33' N., long. 15° 16' W. (Station 350); lat. 26° 21' N., long. 

 33° 37W . (Station 353); lat. 46° 46' S., long. 45° 31' E. (Station 146); lat, 37° 17' S., 

 long. 53° 52' W., 600 fathoms (Station 320). 



Though occurring in several very widely separated localities, this species seems to be 

 nowhere abundant, not more than three or four specimens having been detected in any one 

 gathering. All these are, as I think, referable to the same species, but I am not quite 

 certain that they can be identified absolutely with either of the two forms described by 

 Dr. Ckus. As to Heteroclmta spinifrons, that author lays especial stress upon the 

 length of the anterior antennae : — "die vordern Antennen betriichtlich liinger als der 

 Korper," — whereas in our specimens the antennae are very little, if at all, longer tban the 

 body. Again, in Heterochceta papilligera the posterior foot-jaws are stated to have only 

 one spine: — "am Basalgliede des untern Maxillarfusses fehlt der obere Dorn," — which is 

 conclusive against its agreement with the Challenger specimens. On the whole, though 

 with some doubt, it seems best to accept for the present the specific name spinifrons. 

 None of the specimens which I have examined present the peculiarities ascribed to 

 Heterochwta papilligera. 



Leuckartia, Claus. 



Leuckartia, Claus, Die frei lebenden Copepoden, 1863. 



In general form like Heterochceta. Anterior antennas serrated, twenty-five -jointed: 

 that of the left side in the male geniculated, the five joints preceding the hinge slightly 

 swollen. Posterior antennas and mouth organs similar to those of Calanus. Fifth pair 

 of feet two-branched, that of the right side having the outer branch strongly clawed. 

 Both branches of the first four pairs of feet three-jointed. Each caudal stylet provided 

 with one excessively long and several short setse. Eye altogether wanting. 



I cannot speak from my own knowledge as to the existence or non-existence of an eye. 

 The passage in the foregoing definition which refers to this matter is taken from Claus. 



1. (?) Leuckartia flavicornis, Claus (PI. XV. figs. 1-9, 16). 



Leuckartia flavicurnis, Claus, Die frei lebenden Copepoden, p. 183, pi. xxxii. figs. 1-7. 

 Length, l-4th of an inch (6'2 mm.). Body elongated; anterior antennae slender, 

 about as long as the body, moderately setiferous; those of the male plentifully provided 



