63 Mr. G. S, Brady on Cyprideis torosa. 



small grassy pond near Sedgefield, by the Rev. A.M. Norman, in 

 company with C. lucens, Cypris tristriata, C. affinis, C. ovum, &c. 

 With reference to his specimens, Mr. Norman remarks : " This 

 species approaches very near to C. lactea (Baird), but is wider in 

 proportion to its length, is not so ventricose, and wants the con- 

 spicuous encircling fillet of that species. The surface in C 

 albicans is excavated with very numerous, small, shallow pits ; 

 but in C. lactea it is only sparingly and finely punctate." 



Subgenus Cyprideis, Jones. 

 Cyprideis torosa, Jones. PI. IV. figs. 1 1-23. 



Cyprideis torosa, Jones, Entomostraca of the Tertiary Formation of 

 England, 1856, p. 21, pi. 2. figs. 1 a-l i, and woodcut, fig. 2, p. 16. 



Candona torosa, Jones, Ann. & Mag. Nat. Hist. ser. 2, 1860, vi. p. 27, 

 pi. 3. fig. 6. 



Valves oblong, convex, somewhat broader in front than behind. 

 Ventral margin straight, or with a very slight sinuation, mostly 

 furnished with a single stout spine at the posterior angle ; 

 dorsal margin arched, higher anteriorly. Hinge-margin of 

 the right valve bearing a series of corrugations or elongated 

 tubercles, which are received into corresponding depressions 

 of the opposite valve. Extremities obtusely rounded. The 

 right valve is smaller than the left, and has the dorsal margin 

 inclined more steeply, and almost in a right line, from before 

 backwards. " Surface of the valves marked with closely set 

 angular pittiugs," and with a more or less conspicuous trans- 

 verse sulcus somewhat in front of the centre. Young speci- 

 mens are sometimes furnished also with a few short, thinly 

 scattered hairs, and at the postero-inferior angle, near the 

 spine before mentioned, there is often a conspicuous group of 

 rather long hairs. Lucid spots arranged in a transverse 

 row of about four near the sulcus. Dorsal aspect ovate, 

 irregularly and obsoletely angular. Length -^ ^-go inch ; 

 height -rl^ inch. 



The occurrence of this species in a recent state was first men- 

 tioned by Professor T. Rupert Jones {loc. cit.), who obtained it 

 from ditches of brackish water at Gravesend, and who has kindly 

 supplied me with specimens from that locality for examination. 

 These ditches are now, I believe, nearly silted up with mud and 

 decomposing matter. It has also been taken by the Rev. A. M. 

 Norman on the sands at Weston-super-Mare, to which position 

 it had probably been washed by the Uphill River. Mr. Norman 

 has recently taken it in fresh water in the " Forge Dam," Sedge- 

 field, and in immense profusion in brackish water at Hartlepool. 

 Lastly, I have myself found it in extraordinary numbers in 

 estuarine pools at Warkworth. 



