:M MR. G. S. BRADY'S MONOGRAPH OF 



Cytherideis nobilis (Brady) *, a marine species found on the coast of Crete. Curiously 

 enough, this marine form is also not unlike Qandona Candida in shape and general 

 appearance. 



Lcmrth A—Ar in., height A— <r* in. 



n 111 25 IS 1,x, > "^5"" 46 30 



The males of C. Candida are much more abundant than those of any other species of 

 the family; they appear, indeed, to be almost as plentiful as the females. When their 

 scarcity in other species is borne in mind, this is a very remarkable fact : whether it is 

 constantly the case, or only occurs at some particular seasons, or in favourable localities, 

 I cannot at present confidently state. 0. Candida may be taken as the type of the ^enus 

 Candona ; and the anatomical description given above will apply in its main features to 

 the other members of the genus. 



It is an exceedingly common species, being found almost everywhere, in ponds, lakes, 

 and slowly running streams, and even in brackish water. 



5. C.vn'dona detecta (Miiller). (Plate XXIV. figs. 35-38, and Plate XXXVII. fig. 2.) 



Cypris detecta, Miiller, Entomostraca, p. 49, tab. hi. figs. 1-3. 

 Candona detecta, Baird, Brit. Entom. p. 161. 



Valves, as seen laterally, oblong, reniform, nearly equal in height throughout ; height 

 equal to less than half the length. Dorsal margin evenly and gently arched ; ventral 

 gently incurved in the middle. The extremities are nearly equal in height, and evenly 

 rounded. Outline, as seen from above, oval, tapering equally to the extremities, which 

 are pointed ; greatest width in the middle, equal to more than one-third of the length. 

 End view nearly circular. Surface of the shell quite smooth and shining, pellucid, 

 white ; often with patches of white opacity. The biarticulate seta on the third joint of 

 the lower antenna is slender and tapering, the basal joint being very short (as also in 

 C. albicans, see Plate XXXVI. fig. 12 m). The first foot is robust, its claw long and 

 much curved. Last joint of the second foot very small, bearing two moderately long 

 and one short, the penultimate joint one seta. Postabdominal rami robust ; claws 

 strong and flexuous, the inner and shorter pectinated on both margins (Plate XXXVII. 

 fig. 2i). Male unknown. 



Length A- in., height A in. 



— . ^ uia ^^ y puumiuny in tne Glasgow and Paisley Canal, where it was found by Mr. 



D. Robertson. Dr. Baird gives as localities Beaumont Water and the neighbourhood of London, 



Genus 6. Poxtoctpris, G. O. Sars. 



Shell thin and fragile, higher in front than behind. The first joint of the upper 



antenme gives origin to two short setae, the four succeeding joints each to one, the sixth 



to four, and the seventh to four; those of the seventh joint being much the longest, the 



others gradually decreasing in length : the last joint of the lower antennae is armed with 



our long and slender claws; and from the apex of the antepenultimate j oint springs a 



>rusn o about five set*, the longest of which do not much overreach the apices of the 



terminal claws; at the base of the joint is attached a pedicellated vesicle. Mandibles 



* Transactions of the Zoological Society, vol. v. p. 368. 





