OF TWO SPECIES OF CYPRIS. 233 



revealed themselves to me under a one-eighth objective, and then 

 very faintly, but with a one-sixteenth immersion they were dis- 

 tinctly seen. I also found that one of the short setse was 

 distinctly plumose (PI. XXII. Fig. 5). This is situated on the 

 inner side of the antenna, and is not mentioned by Brady. 

 Again, although it is said the claws of the first feet and second 

 antenna are not serrated, still, near the apices on the inner border, 

 are to be seen some very fine, close-set setcC, which seem to stand 

 out boldly from the margin of the claws. The male is, as a rule, 

 a trifle smaller than the female. 



Brady, in order that his new species may be recognised, gives 

 two drawings : one of the post-abdominal rami and the other of 

 the second foot of the female. If we compare the second foot of 

 the male (Fig. 6) and that of the female (Fig. 7) with Brady's 

 drawing of the second foot of the female,* we shall be convinced 

 that one is the counterpart of the other. The long seta of the 

 second foot seems to be an articulated organ, capable of being 

 bent back on itself The two short setae are of equal length and 

 rigid ; their length is the one-six-hundredth of an inch. This 

 close comparison of the second foot, I think, establishes its iden- 

 tity as the male of C. cmerea, for although in outline the bursa 

 somewhat resembles C. compressa, the second foot of the latter 

 gives a decided negative to its being that species. 



Even to a practical observer, it would be difficult, from exter- 

 nal appearances, to distinguish the male from the female. Its 

 conformation is in every respect similar. The anterior portion of 

 the male may, perhaps, be a little more rounded than in the 

 female, but the difference is not very apparent. 



The male organs consist of a paired mucous-gland, a paired 

 bursa copulatrix, and intromittent organs. The mucous glands 

 are situated in the posterior portion of the carapace in the dorsal 

 region. They are in apposition one with the other, and are 

 nearly vertical. They are cylindrical, and composed of seven 

 whorls or rings. The five intermediate whorls are beset with long 

 filaments. The anterior whorl appears, when seen hi situ, to be a 

 perfect circle ; the periphery projects from the axis of the body, 



* See Plate XXXVI., Figs. 7 and 9, Brady's Monograph of British Ostra- 

 coda, Vol. 26, Trans. Linnaean Society. 



