184 Prof. T. R. Jones on the 



2. Pontocypris Smithii^ sp. nov. 

 (PL IV. figs. 6a-5d.) 



Proportions :— L. .36. H. 20. Th. 16. 



Measurements in lOOOtlis of an, inch : — 



Carapace convex, smooth, subreniform, with rounded ends, 

 equally compressed. The anterior half sloping down quickly 

 and the hinder half slowly from above downwards. Back 

 elliptically convex ; ventral margin rather incurved. Left 

 valve subpyriform, overlapping on the back, and the right 

 valve nearly kidney-shaped, overlapping ventrally. 



Smith Coll. (four specimens) no. 64. Wenlock Beds, 

 Dudley Castle. Also found in the Woolhope Shale, at the 

 Wych, Malvern, by the late Dr. Holl. 



Dedicated to Mr. John Smith, of Kilwinning, Ayrshire, 

 who kindly confided his Collection to me for examination, 

 and who has thus largely added to the store of available 

 specimens of Ostracoda from the Silurian shales of Shrop- 

 shire. 



III. Bythocypris, Brady, 1880. 



Carapace smooth, more or less reniform ; " left valve much 

 larger than the right, which it overlaps both on the dorsal and 

 ventral margins" (''Report Ostracoda of the 'Challenger,'" 

 p. 45). 



1. Bythocypris Hollu, sp. nov. 

 (PI. V. figs. 1 a, 1 ^, 2 ; PI. VI. figs. 3 a, 3 ^, 4 a, 4 h.) 



Length. Height. Thickness. 



CPl.V. fig. 1: 35 19 15^ 



„ . ) PI. VI. fig. 3 : 34 21 17 



Proportions :^p^y_^g^ 2: 34^ 22,^ 



(Pl. VI. fig. 4 (crushed) 33 16 15 



Carapace convex, smooth, reniform, nearly semicircular on 

 the back, gently sinuous below. Edge view acute-oval ; end 

 view ovate. Left valve overlapping the right along the 

 ventral border and nearly all round. In these features it 

 connects itself with Bytkocyprls. PL VI. fig. 3, probably 

 the female, is higher and more ovate than PL V. fig. 1, being 

 more convex in the posterior third and less incurved on the 

 ventral border. PL V. fig. 2 is much higher and proportion- 

 ally shorter than either fig. 1 or PL VI. fig. 3, with a straight 

 ventral and a highly arched dorsal line ; and one end (poste- 



