372 MR. G. S. BRADY'S MONOGRAPH OF 



>/ 



Second foot 



i 



(Subgenus Cypria, Zenker). 



16, Cvi'ims compressa, Baird. (Plate XXIV. figs. 1-5, and Plate XXXVI. fig. 6.) 



ruiiij 



t. \i\. figs. 1 I, \4a-c ; Lilljeborg, De Crust, ex ord. trib. p. 11.2, t. x. fig. 16-18. 

 punctata, Zenker, Anatomisch-system. Stud, iiber die Krebsthiere, p. 77, Taf. iii. a. 



Valves comprised, reniform, about one-third longer than high. The dorsal margin is 

 very much arched, highest in the middle; ventral margin straight or slightly sinuated; 

 extremities broad and well-rounded. Outline, as seen from above, compressed, oblong, 

 point i -d in front, rounded behind; more than twice as long as broad. End view oval, 

 equally rounded at base and apex ; the height very much greater than the width. The 

 shell is smooth and marked with distant but rather large puncta ; colour light brown 

 or straw-colour, transparent, with irregular opaque patches. The setae of the lower 

 antennas are three very long (the apices of the claws reaching scarcely to the middle of 

 the set;p), and three of about one-third this length. The Particulate seta attached to 



5 



the inner side of the second joint is considerably elongated, and has a distinctly taperin 

 vesicular apex, which is also apparent in the other members of this section (see Plate 

 XXXVI. fig. 5 b). The setae attached to the inner side of the mandibular palp are very 

 strongly plumose, and from their structure would almost appear to act as accessory 

 respiratory organs (fig. 6w)-a peculiarity which also exists throughout this section, and 

 is sometimes, to a smaller extent, observable in other members of the genus. The 

 mucus-^land of the male is terminated by a peculiar calyptra-like prolongation (fig. 

 6 m). The last joint of the second foot bears three setae — one excessively long and more 

 than equalling in length the three preceding joints, and two others much shorter, the 

 shortest of all being slightly flexuous. The abdominal rami are rather short and stout, 

 the terminal claws much curved, and bearing one or two teeth near the apices, the 

 uppermost seta far removed from the rest and situate near the middle of the ramus. 



Length -^ in., height ^ in. 



C. compressa is a common species in ponds and ditches, often living where there is 

 little or no ve-etation. Dr. Zenker identifies this species with the C. punctata of Jurine ; 

 bnt the figures and description of the latter author are so vague, and in some respects 

 so unlike C. compressa, that I cannot coincide in this view. 



i 7. Cypris striolata, Brady. (Plate XXIV. figs. 6-10.) 



Tjrn 



Nat 



Carapace broadly subovate; greatest height in the middle, equal to about two-thirds 

 oi the length. Dorsal margin strongly arched, sloping with a gentle curve toward the 

 anterior, but with a bolder sweep towards the posterior extremity, ventral margin 



mostly somew 



Anterior and posterior margins rounded, the former some 



hat narrowed. Seen from above, the outline is compressed, oval, rather narrowed 



