1284 



CRUSTACEA. 



partly off from the other, and appeared as seen in figure 9 h, These 

 fio-ures represent also the corneous processes, which lie in the surface 

 of these fleshy lobes ; those of figure 9 g are on the inner surface of 

 the lobes. Figure 9 i, represents another view obtained, in which the 

 caudal extremity (c) was observed pushed above the rest, as if a dis- 

 tinct piece, for a greater length than simply the small appendage. 

 This appendage was a little pubescent at extremity and was not dis- 

 tinctly jointed. In the female form, figure 9 a, the caudal appendage 

 was two-jointed (fig. 9 a and 9 I), and instead of the stout spine on 

 the margin of the lobes, there is a small joint bearing two naked setae 



(s, fig. 9 a). 



In some instances, after putting the females in hot water, they 

 came out with simply the extremity of the abdomen exserted, the 

 caudal appendage and the joint on the margin below («), with the 

 part intervening, being outside the shell. 



The shell in the Cytherinse is much thicker than in Cypris, and is 

 marked with granules , or lines. In the species referred to for the 

 above illustrations, the surface under a high magnifier has the appear- 

 ance represented in figure 9 c. There is a translucent margin around, 

 which is narrow in the part of the shell below the mouth organs. 

 The rest is too opaque to permit a view of any organs or parts be- 

 neath. Through the translucent margin there are at intervals minute 

 ducts, which terminate each in a short hair on the margin, as seen in 

 figs. 9 b, 9 c. The hinge in Cythere consists of a large number of 

 minute truncate teeth ranging along the dorsal margin (fig. 9 a). 



Subfamily CYPRINiE. 

 Genus CYPRIS, Muller. 



The separation of the Candona of Baird from Cypris is based on the 

 habits of the species — their crawling over aquatic plants— and the 

 absence of a tuft of long setas from the apex of the third joint. Our 

 C. albida, beyond, was observed to have the habits of a Candona, and 

 may possibly be of that genus. 



