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



This specie approaches near to C. crassa of Muller, as described by him, but differs 

 toto from the figures which he gives of it. 



" Hah. In a pond near Copenhagen Fields, July 1836" (Br. Baird). 





11. Cvpris salina, Brady. (Plate XXVI. figs. 8-13.) 



Cijjiris ttriiftita, Baud, Brit. Entom. p. 157. 



Valves reniform, compressed, about once and a half as long as broad. Extremities 

 broadly rounded, nearly equal, and produced into flattened laminae, which form a 

 llange encircling nearly the whole shell. The ventral margin is slightly sinuate in the 

 middle, and in the right valve is finely crenulated or toothed round each extremity : 

 dorsal margin very strongly arched and highest rather in front of the middle. Seen 

 from above, the carapace is compressed, oblong-ovate, acutely pointed in front and 

 more obtusely behind, widest in the middle; there is a slight longitudinal sulcus on the 

 hinge-line near the posterior extremity, formed by the juxtaposition of the incurved 

 margins of the two valves. The contact -margins of the ventral surface are sinuous and 



remarkably prominent. End view ovate, compressed, the breadth equal to two-thirds of 

 the height. Lucid spots similar to those of C.fusca. The surface of the valves is very 

 finely punctate, and marked with a pattern of brown which may be described as follows : 



Commencing under the middle of the dorsal margin a brown belt runs backwards, 



coursing nearly parallel to the circumference of the valve, and ceasing near the summit 

 of the anterior border; on the central light-coloured patch thus nearly enclosed by a 

 brown zone are two large, irregular, brown blotches, the hindermost of which sends up- 

 wards and forwards a prolongation connecting it with the marginal belt. Abdominal 

 rami Blender. Setae three long and one short, all near together. 

 Length ^ in., height jt in. 



I first met with C. salina in a cooling-pond at Monkwearmouth Colliery, where it 

 lives in great numbers together with Cypridopsis aculeata, Cypris reptans, and other 



pedes, in water which often reaches a temperature of 100° Eahr. and is so impregnated 

 ith earthy salts as to deposit a thick coating of carbonate of lime on the leaves of the 



S 



plants which it supports. I have this year (1865) been fortunate enough to find the species 

 in a second locality, namely, a small pool of somewhat brackish water, above high-water 

 mark, in a salt marsh north of the river Coquet, below Warkworth. This habitat is 

 particularly interesting, inasmuch as it leaves little doubt that the species here referred 

 to must be the same as that discovered by Dr. Baird in a similar situation (" pool on 

 seashore a little above high-water mark, at Thornton Loch, East Lothian, June 1835 ") 

 a matter hitherto doubtful, owing to the fact that the Scotch specimens have not been 

 preserved. Mr. D. Robertson has also lately found this species in a pond liable to tidal 

 overflow at Cumbrae. 



I much n :vet that I have not been able to obtain examples of the form known to con- 



glT 



mental naturahsts as C. strata (Mailer) ; for though the written descrint^ e 



that author* accurately agrees with the British species, his figures are very far wrong. 



* Miiller's description of the carapace is tery terse and expressive :_•< Testa subovata, glabra, margioe ciliata, aJ 





