so MR. g. S. BRADY'S MONOGRAPH OF 



t nior extremities rounded gradually towards the short and straight dorsal margin, sud- 

 denly towards the ventral margin, which is more or less deeply sinuated. Seen from 

 above, the out line is compressed, ovate, ohlong, pointed in front and rounded behind, 

 tin* sides n arly parallel, width equal to much more than one-third of the length. End 

 view broadly ovate, obtusely pointed above, rounded below. The shell is covered with 

 rather large and closely set angular puncta, and bears a few scattered slender hair 

 round the anterior and posterior margins. Lucid spots six, irregularly quadrate (fig. 24). 

 Colour O] tque white, uniform or with pellucid patches. 



Length ^ in., height ■£$ in. 



C. albicans has been taken abundantly by the Rev. A. M. Norman in a small grassy 

 pond at Sedgefield (Durham), by Mr. D. Robertson in the Glasgow and Paisley Canal, 

 and by myself near Sunderland. It is nearly allied to the following species, but smaller, 

 more profusely punctate, and considerably less tumid. 



■1 < an-dona lactea, Baird. (Plate XXIV. figs. 55-58.) 



Ctmdona lactea, Baird, Proc. Zool. Soc. Loud. 1850, p. 255, pi. xviii. (Annulosa) figs. 25-27. 



Late nil view oblong, -ubquadrangular, nearly equal in height throughout; height 

 equal to half the length. Extremities obliquely rounded, equal. Dorsal margin straight, 

 ventral gently sinuated. Seen from above, the shell is oblong-ovate in outline, some- 

 what pointed in front; greatest width about the middle, and equal to half the length ; 

 the left valve considerably overlapping the right. End view suborbicular, the width 

 slightly less than the height. Surface smooth, finely and sparingly punctate. Colour 

 greyish white. 



Length -£g in., height ^ in. 



Hab. " Freshwater pond at Charing, Kent ; and Regent's Park— T. Rupert Jones, Esq." {Dr. Baird) 



3. Can dona compressa (Koch). (Plate XXVI. figs. 22-27.) 



(fid< 



Candona compressa, Lilljeborg, De Crust, ex orcl. tribus, p. 129, tab. xxvi. figs. 1-3. 

 Cypris setiyrra, Jones, Tertiary Entomostraca of England, p. 12, pi. i. figs. 6a-6d. 



Lateral aspect compressed, subreniform, higher behind than in front ; greatest height 

 equal to more than half the length. Anterior extremity obliquely rounded, sloping 

 steeply above to join the short and straight dorsal margin ; the posterior broad and well 

 rounded. Ventral margin incurved in front of the middle. Outline, as seen from above, 

 compressed, oval, acuminate in front, widest in the middle, width equal to less than half 

 the length. End view oval. Surface smooth, milk-white, thickly covered with very 

 short and fine hairs, and often marked with a minutely reticulated pattern. Lucid spots 

 six, arranged in two transverse rows. 



L igth & in., height 5V in. 



C ndona compressa was taken by Mr. D. Robertson in the Glasgow and Paisley Canal ; 

 and a single valve, apparently belonging to the same species, occurred amongst Ostra- 



coda found by Dr. Alcock in shell-sand from Eoundstone. The peculiar reticulated 



