REPORT ON" THE COPEPODA. 119 



slender, the joints being from twice to thrice or four times as long as broad, the caudal 

 stylets very slender, and bearing four terminal setae, the longest of which are about twice 

 as long as the furca. 



Habitat.— In lat. 6° 48' N., long. 122° 25' E. (Station 200); lat. 40° 3' S., 

 long. 132° 58' W. (Station 288) ; lat. 9° 43' S., long. 13° 51' W. (Station 342) ; 

 lat. 12° 16' S., long. 13° 44' W. (Station 341); lat. 5° 28' N., long. 14° 38' W. 

 (Station 349) ; lat. 9° 9' N., long. 16° 41' W. (Station 351). 



All these are Atlantic Stations, and situated either within or near the tropics, but the 

 type specimens described by Dr. Claus were taken in the Mediterranean (Messina), and, 

 so far as appears, are in every respect similar to those brought home by the Challenger, 

 The male was not seen by Dr. Claus, but I think there can be little doubt that the form 

 figured here in PI. LIV. figs. 3, 4, is referable to that sex ; in all structural details it 

 agrees with the female Lubbockia squillimana, except in the presence of a single very long 

 antennal seta, in the weaker build of the posterior foot-jaw, the somewhat different form 

 of the last two thoracic segments, and the slightly larger size of the animal. Only two 

 examples of the male were found, both from Station 349. From the other Stations 

 only very few specimens have been discovered, not more than about a dozen in all. 



Onccea, Philippi. 



Onccea, Philippi, Wiegruaim's Archiv, 1843. 

 Antaria, Dana, Proc. Amer. Acad. Sci., 1849. 



In general appearance much like Cory emus. Corneal lenses (conspicilla) small, 

 situated in the front of the head. Fifth thoracic segment very small, and bearing a pair 

 of very minute rudimentary feet. Abdomen of the male five-, of the female four-jointed, 

 the median joints very small, first joint very large. Anterior antennas short, six-jointed, 

 posterior, three-jointed, prehensile, the last joint armed with numerous setae. Swimming 

 feet four pairs ; all the branches three-jointed. 



The generic name Onccea, proposed by Philippi, is ignored by Claus on the ground of 

 insufficient description, but Philippi's figures are so characteristic as to leave no doubt, as 

 I think, of the animal to which they are intended to apply ; the description also, as far 

 as it goes, is perfectly applicable, though incomplete, owing to the accidental loss of the 

 specimen before the author's observations were finished. On the ground of priority, 

 therefore, it seems right to adhere to the name Onccea. 



The genus is a very interesting one, as though agreeing with other Corycaeidae (and 

 especially with Corycceus) in the essential characters of mouth-apparatus, as well as in the 

 general appearance of the animal, it differs altogether in the structure of the posterior 

 antennas, which, though prehensile, are more like those of Cyclops, and of the foot-jaws, 

 which resemble those of some Harpacticidae ; the caudal stylets are very distinctly Cyclo- 



