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



may not require emendation. In general character, however, it is clear that these organs 

 are very similar to those of such genera as Corycceus and Lichomolgus. As to specific 

 characters, I find nothing to separate the Challenger captures from the form described by 

 Dana as CopUia mirabilis, and it is perhaps doubtful whether either Dana's second species 

 Copilia quadrata, or the Cojjilia denticulata of Claus, is sufficiently distinct to entitle it 

 to stand as separate species. I have not been able to distinguish certainly the two sexes 

 of this species, though the slight differences observable in the structure of the posterior 

 foot-jaws may possibly be of sexual importance. 



Lubbockia, Claus. 

 Lubbockia, Claus, Die frei lebenden Copepoden (1863). 



Body narrow and elongated ; eyes wanting. Anterior antennae six-jointed ; posterior 

 four-jointed, and armed at the apex with several curved prehensile setae. Mouth- 

 organs small, very like those of Corycceus; posterior foot-jaws very large, prehensile_ 

 First four pairs of feet having both branches three-jointed, — the internal much the 

 longer ; fifth pair rudimentary. Abdomen four-jointed in the female, five-jointed in 

 the male. Ovisac single. 



G 



Lubbockia squillimana, Claus (PI. LIII. figs. 12-16, and PI. LIV. figs. 1-7). 



Length of female, l-15th of an inch (1*6 mm.), of male 1-1 2th of an inch (2 - l mm.). 

 The cephalothorax and abdomen are about equal in length, the latter excessively slender, 

 and separated very distinctly from the thorax ; thorax very narrowly ovate, the last 

 segment, in the female, having produced lateral angles, and sharply separated from the 

 rest, lateral angles of the last but one produced on the posterior aspect, so as to form 

 two short spines. Anterior antennae of the female (PI. LIII. fig. 12) six-jointed, scarcely 

 one-third as long as the first body segment; posterior (fig. 13) slightly shorter, and 

 clothed with numerous nearly equal hairs ; in the male (PL LIV. figs. 3, 4) the anterior 

 antenna has several small and one very long seta, nearly as long as the entire animal. 

 The posterior foot-jaw of the female (PI. LIII. fig. 14) is very large, and forms a strongly 

 clawed prehensile organ, the hand armed on its concave edge with four or five very stout 

 triangular spines, the terminal claw longer than the hand, stout and falcate ; that of the 

 male (PI. LIV. fig. 7) is much smaller, and the hand is destitute of spines. The swimming- 

 feet (PL LIII. fig. 15) have the marginal spines of the outer branch laminar and leaf-like, 

 or lancet-shaped, with very finely serrated edges, — very delicate in structure and pellucid, 

 The fifth foot (fig. 16) consists of a single joint, terminating in two laminated setae or 

 spines like those of the swimming feet. The abdomen is in the female equal to about 

 two-thirds, and in the male to the entire length of the cephalothorax ; it is extremely 



