3('.< » 



MR. G. S. BRADY'S MONOGRAPH OF 



t'lni pr.lifor 



pair small, ample; in the female bearing a simple subcorneal palp, in the male 



n. Two pairs of feet : the first stout and five-jointed, terminated by a long 



run 



fid 



second pair more slender, and usually bent upwards within the valves 

 abdomen forming two long moveable rami, which are sometimes rudimentary and 



Eye 



etiform, hut oflener well developed and terminating in two strong curved cla^ 



altogetli r wanting ; rarely t 



Intestinal canal forming two pouches 



Copulative organs of the male situated 



m 



and testes lying immediately beneath the shell 



immediately in front of the postabdominal rami, and provided with testes 



lands of complex structure. 

 Til,- animals belonging to this family have been considered, until very recently, to be 



inhabitants exclusively of fresh water 



G. O. Sars, however, has shown that several 



n-ms hitherto classed among the Cytheridae properly belong to the Cypridae 



these 



>pecies now 



titute the genera Pontocyprls and Macrocypris 



addition to which 



other entirely new forms have been described under the names Paracypris, Aglaia, and 



. IrgiWicia. Lastly, the genus Pairdla, M'Coy, is here shown to belong to the same family. 



The annexed Table shows the chief distinctive characters of the different genera. 



Afjlaia and Arr/illcecia, however, have not yet been found in the British seas : 





Z 



~ 



possessing a branchial 

 appendage; palp sub- 

 corneal, indistinctly 

 jointed, ending in .* 

 aetee. 



r S l , Hng Set^Tf 'the! T U devel °P ed > terminating in two 



upper antennae very 



strong curved K Cypris 



Second joint of lower 

 antennae 



[ claws 

 rudimentary, setiform Cypridopsis. 



r 



rami J 



without a brush of setae. Setae of the upper antennae 



short. First and second pairs of feet 



very 



alike . • \Paracypru. 

 dissimilar [Aglaia. 



z 





! subconical ; indistinct- 

 ly jointed. Setae of 

 the lower antennae 



(long, reaching beyond the apex of the terminal) ^otodromas. 

 ! claws. Two eyes . . . . I 



altogether wanting. One eye 



Candona. 



" 



- 



- 



— 



c 



8 



destitute of a branchial 

 appendage. Palp 



distinctly jointed, 

 subpediform, 



3-jointed. 

 Upper antennae 



f elongated, 7-jointed, armed [ Pontocyprls. 

 with long setae ' 



short and robust; 5-jointed,^ 



in the female shortly setose; L^rgfflpcia. 



in the male provided with a f 



few long setae 



J 



4-jointed. 



Upper antennae 



shortly setose. 



Postabdominal 

 [rami 



j 



largely developed, terminatin 

 in several long setae . 



rudimentary • . • 



cr 



- 



Bairdia. 



Macrocypris 







Genus 1. Cypris, Muller. 



Valves mostly suhreniform or elongate-oval, horny in texture. Upper antennae seven- 

 jointed, and heset with numerous long plumose setae, which are mostly distributed as 

 follows,— four from the apices of the fourth, fifth, and sixth joints, and three from the 

 pex of the terminal or seventh joint. Lower antennas five-jointed, bearing a fascicle of 

 live or six setae of variable length, and on the inner side of the third joint a short bi- 

 articulate seta ; terminating in four lonsr curved and serrated claws ; a few short set* 



from the sides of the fourth joint, near the middle. Second pair of jaws sn 

 first, in the male prehensile, and in the female consisting of a short, simple 



allev 



