360 



MR. G. S. BRADY'S MONOGRAPH OF 



second pair small, simple ; in the female bearing a simple subconical palp, in the male 

 often pediform. Two pairs of feet : the first stout and five-jointed, terminated by a lon^ 

 curved claw ; the second pair more slender, and usually bent upwards within the valves. 

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

 setiform, but oftener well developed and terminating in two strong curved claws. Eye 

 single or altogether wanting ; rarely two. Intestinal canal forming two pouches ; ovaries 

 and testes lying immediately beneath the shell. Copulative organs of the male situated 

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

 glands of complex structure. 



The 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 

 forms hitherto classed among the Cytheridae properly belong to the Cypridse; these 

 species now constitute the genera IPontoc7/p7^is and Ifacrocf/pris ; in addition to which 

 other entirely new forms have been described under the names I^araci/prls, Aglaia, and 

 Argilloecia. Lastly, the genus Bairdia, M'Coy, is here shown to belong to the same family. 



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

 Aglaia and Argillcecia, however, have not yet been found in the British seas : — 



'possessina: a branchial fbearinor a brush of^ ^^ 3 ^ a ^ • ■ ^ j. j 



^ -1° 1 1 4°04- e 4-\. \ ■^vell developed, termmatinpr lu two strono- curved 



firmpTinao'ti • list. m .Qiin- ftprsp ^^pr.rp nt thp , r 7 a c 



appendage; palp sub 

 conical, indistinctly 

 jointed, ending in 3<( 

 seta3. 



Second joint of lower 

 antennae ; 



claws 

 rudimentary, setiform 



I Cijpris. 



destitute of a branchial 

 appendage. Palp 



setpe. Setaa of the 

 upper antennae very 

 long. Postabdominal 

 rami J 



without a brush of setre. Set;e of the upper antennae very 

 short. First and second pairs of feet .... 



V ■ 1 • J- ij i. flong', reaching beyond the apex of the terminal I -.^ , , 

 subconical, indistinct- i rn ° ^ > isotodromas. 



, ■ • i J a i £1 claws, iwo eyes 1 



ly jointed, betae oi<| •' ' 



the lower antennae 



Cypridopsis. 



I alike . . i Paracypris. 

 ( dissimilar j Aglaia, 



[^altogether wanting. One ej-e 



Candona. 



distinctly jointed, 

 subpediform, 



.3-jointed. 

 Upper antennae 



4-jointed. 



Upper antennae 

 shortly setose. 

 Postabdominal 

 ^ rami 



'elongated, 7-jointed, armed > Pontocypris. 

 with long setfe . . . ' 



short and robust; .5-jointed, j 



in the female shortly setose ; I ^ •„ 



in the male provided with a r^rgUlcBcia. 



few long setae . . . J 



j largely developed, terminating i Bairdia. 

 \ in se^'eral long setae , . ' 



rudimentary 



Macrocypris. 



Genus 1. Cypris, Miiller. 



V alves mostly subreniform or elongate-oval, horny in texture. Upper antennse seven- 

 jointed, and beset with numerous long plumose setse, which are mostly distributed as 

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

 apex of the terminal or seventh joint. Lower antennae five-jointed, bearing a fascicle of 

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

 articulate seta ; terminating in four long curved and serrated claws ; a fcAV short setse 

 also arise from the sides of the fourth joint, near the middle. Second pair of jaws smaller 

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



