REPORT ON THE COPEPODA. 67 



Fifth pair of feet in the female composed of one triarticulate branch on each side ; tho 

 of the male dissimilar, the right usually prehensile. Abdomen composed in the female 

 of three, in the male of five somites. Rostrum short and rounded. 



The chief distinctive characters of the genus Candace are found in the very largely 

 developed anterior, and almost obsolete posterior foot-jaw ; the armature of the anterior, 

 consisting of numerous very strong non-ciliated uncinate seta?. The right antenna of the 

 male is always strongly geniculated, swollen in the middle, and usually provided with 

 dentated marginal plates, and several of the basal joints are strongly toothed on the 

 outer margin. The first abdominal somite in the adult female is often greatly swollen and 

 angulated. The eyes are two lateral refracting bodies with one unpaired central ocellus. 

 The external margins of the outer branches of the swimming feet are often finely 

 pectinated, and those of the third and fourth pairs coarsely serrated towards the apex. 



The genus is widely distributed, often occurring in considerable numbers. Its 

 members may usually be distinguished at a glance, often even without the help of a 

 lens, by the deep brown or black colouring which pervades parts, or sometimes the 

 whole, of the body. The parts most liable to this coloration are the swimming feet, 

 the anterior part of the long antennas, and the cephalothorax. Only rarely is a specimen 

 found entirely without colouring, some tinge of brown being almost universally visible 

 in the tips of the various spines, or in the plumes of the feet, even when the rest of 

 the animal is colourless. 



1. Candace pectinata, Brady (PI. XXX. figs. 1-13). 



Candace pectinata, Brady, Monog. Brit. Copep., vol. i. p. 49, pi. viii. figs. 14, 15, and pi. x. 

 figs. 1-12. 



Length, l-8th of an inch (3'1 mm.). Cephalothorax (figs. 1, 2) robust, truncated in 

 front, scarcely at all tapered towards the extremities, posterior lateral angles produced 

 into strong spines. Anterior antenna? as long as the cephalothorax (fig. 3), twenty- 

 three-jointed, several of the basal joints (thh'd to seventh) bearing strong marginal 

 teeth ; the seta? are irregular in size, those at the apex of some joints being very long, 

 the rest comparatively short; in the male (figs. 4-6) the seventeenth joint of the right 

 antenna (that on the proximal side of the hinge) bears a strongly pectinated crescentic 

 marginal plate, the central teeth of which are the largest ; the sixteenth joint is 

 minutely pectinated, and the eighteenth bears a short beard-like fringe of seta? ; several of 

 the basal joints bear short, club-shaped sensory filaments ; joints from the seventh to the 

 eleventh on the right side, — seventh to tenth on the left side (and on both sides in the 

 female), very small. The terminal spines of the third and fourth pairs of swimming feet 

 are usually twisted at the apex ; the inner branches, and the inner halves of the outer 

 branches (figs. 7, 8), are mostly coloured brown or black, the seta? also deeply coloured 



