REPORT ON THE COPEPODA. 109 



Habitat. — The following gatherings contained specimens of Setella gracilis : — Surface- 

 net collections taken in January and February 1875, off the north coast of Papua, and 

 among thePhilippine Islands ; between Api and Cape York, north of the Sandwich Islands, 

 in lat, 30° 22' N., long. 154° 56' W. (abundant) ; inlat. 36° 44' S.,long. 46° 16' W. (Station 

 325) ; lat. 9° 43' S., long. 13° 51' W. (Station 342) ; lat. 3° 10' N., long. 14° 51 W. 

 (Station 348); at Zamboanga (abundant) ; and in lat. 13° 50' S., long 151° 49' E. (Station 

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



Section II. Pcecilostoma, Thorell. 

 Family I. Coryc^id^e, Dana. 



Cephalothorax elongated or subpyriform, abdomen much narrower, usually elongated, 

 and distinctly separated from the cephalothorax. Anterior antennae alike in both sexes 

 (? except in LubbocJcia), five or six -jointed ; posterior simple, three- or four-jointed, forming 

 a prehensile hand, which is clawed or armed with curved prehensile setse at the apex. 

 Mouth-organs (except the posterior foot-jaws) minute, and destitute, or nearly so, of 

 palps. Posterior foot-jaw prehensile, and in the male powerfully clawed. First four 

 pairs of feet alike, or nearly so, adapted for swimming, two-branched, and armed with 

 lancet-shaped lateral spines ; fifth pair rudimentary, alike in both sexes ; rarely 

 absent. Heart wanting. In addition to two small median eyes, there are usually 

 tw T o lateral eyes, with large, conspicuous lenses (eyes absent in Lubbockia X) ; ovisacs 

 usually two. 



In the Monograph of the British Copepoda, I followed Thorell in separating the 

 Saphirinidse and Corycasidse, but have here adopted the older, simpler, and, as 

 I now think, the more natural plan adopted by Dana and Claus. The Saphirinidse 

 occupy, in fact, a very similar position in relation to the Corycasidae, as the Peltididse 

 to the Harpacticidae, the differences being more of outward appearance than of 

 structure. 



Corycmis, Dana. 



Corycmus Dana, Proc. Acal. Nat. Sci., Philadelphia, 1845.' 



Body elongated, subcylindrical (PI. LII. figs. 1, 2); abdomen two-jointed, 

 penultimate segment of the cephalothorax produced ventrally into two hook-like 

 processes, last joint of the cephalothorax very small and overlapped by the preceding- 

 joint. Anterior antennae (fig. 6) six-jointed, short ; posterior (figs. 7, 8) uncinate, strongly 

 prehensile, terminal claw longer in the male. Mandibles (fig. 9, a) divided into two 

 apical processes (a', a'), and bearing a small setiferous palp (a") ; maxilla (fig. 9, b) 

 composed of an uncinate lamina and several setiferous marginal processes. Anterior 



