72 



of the most comprehensive of the Cypridae. On this raison a grouping of the 

 numerous species has been attempted by some recent authors; but it appears 

 to me that the limits of these groups are very difficult to define precisely. 

 All the species of the present genus seem to be confined to the northern 

 hemisphere. I have no knowledge of any true Candona being found south of 

 the line. 



13. Candona Candida. (O. Fr. Mtiller). 



(PI XXXII & XXXIII). 



Cypris Candida, O. Fr. Mtiller, Entomostraca, p. 62, PL VI, figs. 79. 



Syn: Monoculus Candidas Jurine. 



Candona lucens, Baird. 



Specific Characters. Female. Shell moderately tumid, seen laterally, 

 irregularly oval or sub-triangular in outline, higher behind than in front, greatest 

 height considerably exceeding half the length, dorsal margin evenly arched, 

 sloping very steeply behind, but rather slowly in front, ventral margin slightly 

 sinuated, anterior extremity narrowly rounded, posterior obliquely deflexed and 

 terminating below in an obtuse corner; seen dorsally, oblong oval in outline, 

 greatest width in the middle and nearly attaining half the length, both extremities 

 obtusely pointed. Valves only slightly pellucid and of rather firm consistency, 

 surface smooth and shining, with distant small pits, and only sparingly hairy 

 at each extremity; inner duplicatures moderately broad. Vibratory plate of 

 maxillipeds replaced by a single seta. Posterior legs only 4-articulate, the 

 penultimate joint not being subdivided, all 3 apical setae well developed, though 

 of somewhat different length. Caudal rami conspicuously curved and slightly 

 attenuated, apical claws rather strong, the distal one about half the length of 

 the ramus, dorsal seta well developed and attached at a distance from the tip 

 about equal to V 3 of the length of the ramus. Genital lobes of moderate size 

 and produced behind to a subtriangular corner. 



Male slightly larger than female, but scarcely differing in the shape of 

 the shell, except by the somewhat deeper ventral sinus. Prehensile palps of 

 maxillipeds not much dissimilar, both being subfusiform in shape, with 2 

 thickish setae inside the middle and the dactylar part somewhat thickened at 

 the end; right palp however a little broader than the left and more curved. 

 Caudal rami scarcely at all curved, but otherwise of same structure as in female. 

 Copulative appendages with one of the terminal lappets extending upwards at 

 almost right angle to the axis of the appendage. 



Colour in both sexes pure white, with the dark contenta of the intestii 

 only faintly traced through the shell. 



