On Stenocypris Chevreuxi. 17 



shell from extraneous matter, for which reason these legs 

 are generally termed in the German language »Putzfiisse». 



The genital lobes (see figs. 11 and 12) occurring between 

 the posterior legs and the insertion of the caudal rami, 

 constitute 2 juxtaposed, transversely oval expansions. At 

 their posterior end the genital orifice seems to occur, and 

 a number of distinct muscular fibres are seen to converge 

 to this place. Farther in front, and somewhat inside the 

 lobes, there is a funnel-shaped hollow bounded by some 

 strong, curved chitinous stripes, and immediately above it 

 may be traced, a peculiar orbicular body, which, on a closer 

 examination, is found to be formed by a narrow duct coiled 

 up into numerous dense spiral coils, and finally joining the 

 above-mentioned hollow. Zencker has explained these hol- 

 lows as the »vulvæ«, and the coiled duct to be destined 

 for the passage of the thread-like zoosperms, believing 

 that the receptacula seminis are in direct communication 

 with this duct. I am by no means convinced of the correct- 

 ness of this explanation. In the present form, not the slightest 

 trace of any »receptacula seminis«, is to be found, and I 

 should therefore be more inclined to believe that the duct 

 is in reality destined to secrete a viscid fluid, from which 

 the egg-shell may be formed. 



The caudal rami (see figs. 12, 13) are rather strongly 

 developed, fully equalling in length the free abdominal part 

 of the body. They are in the form of 2 juxtaposed 

 narrow plates, which, however, at the base are united 

 (see fig. 12). Each ramus is armed at the end with 2 

 strong claws, and has the outer half of the dorsal edge 

 divided into 4 or 5 slight lobes edged with a comb -like 

 series of strong denticles (see fig. 13 a). Of the claws the 



