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



Habitat — Between Api and Cape York ; offKandavu, Fiji ; off south coast of Papua ; 

 at several Stations oft' the Philippine Islands ; Pacific, north of Sandwich Islands ; Atlantic, 

 lat. 27° N. ; lat. 4G C 4G' S., long. 45° 31' E. ; hit, G4° 37' S., long. 85° 49' E.; lat. 9° 43° 

 S., long. 13° 51' W. 



The slender, straight spines and exceedingly fine serrations of the swimming feet, 

 the absence of denticulated plates on the right male antenna, the non-prehensile fifth feet 

 of the male, and the usual colourlessness or very sparing coloration of the animal, serve to 

 distinguish this from any other described species. Except in the structure of the fifth 

 pair of feet in the female, the species described by Claus as Candace bispinosa seems to 

 agree entirely with Candace truncata. The specimens from which my drawing (PL XXIX. 

 fig. 11) was made, occurred in a gathering from the Atlantic, north of Ascension Island, 

 and are undoubtedly identical with Candace bisjnnosa, Claus ; but I have not been able to 

 detect any other character separating them from Candace truncata, Dana, and there- 

 fore prefer, for the present at any rate, to consider them as a variety of that 

 species. 



Dana's statement of a " twenty- to twenty-two-jointed " antenna does not apply to 

 this species, but the joints near the base of the limb are often difficult to see, and almost 

 impossible to count correctly with low powers of the microscope. The figures here 

 given (PL XXIX. figs. 1, 3) show different numbers of joints, fig. 1 having been drawn 

 with a low power and left uncorrected, fig. 3 with a higher power. One of the 

 diagnostic marks given by Dana — " second joint stout, not longer than third or fourth," 

 — would thus apply to our fig. 1, but not to fig. 3. 



Corynura, 1 n. gen. 



Cephalothorax slender, cylindrical, head coalescent with first thoracic somite, abdomen 

 five-jointed in the male, three-jointed in the female. Right anterior antenna of the male 

 geniculated, and provided with serrated plates. Mandible -palp bearing two small one- 

 jointed branches. Maxilla destitute of a palp, composed of a stout setiferous base and a 

 slender, one-jointed apical portion. Anterior foot-jaw as in Acartia, excepting that the setae 

 are for the most part not plumose; posterior foot-jaws also like those of Acartia, but that 

 the apical portion is rudimentary and uniarticulate. Fifth pair of feet simple, unbranched, 

 in the male prehensile. Caudal stylets much elongated, and dilated at the apices. One 

 large eye (?) situated in the front of the forehead. 



The anterior antennas and fifth pair of feet are closely similar to the same organs in 

 Pontella, but the peculiar structure of the maxillae, the unjointed (or very indistinctly 

 jointed) and rudimentary apex of the posterior foot-jaw, together with the remarkably 



1 xoovun, a club ; ovpx, a tail. 



