CYPBINA. 135 



Sowcrby, by Briart and Cornet, : appears to be more nearly related to G. cuneata 

 than to G. angulata. 



G. securiformis, Sliarpe, 2 is similar to G. cuneata, but its ventral margin lias a 

 much greater curvature. 



G. cuneata is mentioned by Stoliczka as a typical example of the sub-genus 

 Veniella, Stoliczka. 3 The anterior right cardinal tooth, however, does not appear 

 to be so strongly developed as in the type of Veniella. 



Types. — The types came from Blackdown, but cannot now be found. 



Distribution. — Upper Green sand (zone of SchlcenbacMa rostrata) of Blackdown 

 and Haldon. Upper Greensand (Me5'er's Bed 2) of Weston Mouth (Devon). 



Oyprina claxbiensls, sp. nov. Plate XXI, fig. 2; Plate XXIV, fig. 1. 



Description. — Shell large, stout, oval, rather elongate, considerably inequilateral, 

 moderately convex. Antero-dorsal margin short, straight or slightly concave. 

 Anterior margin well rounded, passing gradually into the convex ventral margin. 

 Posterior margin oblique, sub-truncate, more or less rounded. Postero-dorsal 

 margin rather long, slightly convex. Umbones broad, curved anteriorly, with a 

 rounded carina extending to the postero-ventral extremity, and limiting a flattened 

 or somewhat convex postero-dorsal area which slopes rapidly to the postero- 

 dorsal margin, but more gradually to the posterior margin. Lunular region 

 excavated, not limited. Ornamentation consists of small concentric ribs. 



Hinge : in the right valve the anterior cardinal is conical, larger than the 

 median cardinal, and placed below and separated from the latter ; the posterior 

 cardinal is oblique, laminar, and divided by a furrow. In the left valve the 

 anterior and median cardinals are stout, the posterior cardinal is oblique and 

 laminar. 



Measurements (approximate) : 



(i) (2) (3) 



Length . 99 . 80 74 mm. 



Height . 75 . 04- . 56 „ 



Affinities. — This species resembles C. Constauti, Dollfus, 1 from the Kimeridgian, 



1 Meule de Bracquegnies ('Mem. cour. et Mem. cles. Sav. etrangers,' vol. xxxiv, 1867), p. 68, pi. 

 viii, figs. 26-28. 



2 ' Quart, Journ. Qeol. Soc.,' vol. vi (1850), p. 182, pi. xxii, figs. 1—3. C. glubom, Sliarpe (Ibid., 

 p. 182, pi. xv, fig. 1) is recorded by Morris from Blackdown, but I have seen no example of it, 



3 'Palaeont, Indica, Cret. Fauna S. India,' vol. iii (1870), p. 189. See also Meek, 'Invert. Cret. 

 and Tert. Foss. IT. Missouri' (1876), pp. 147—152. 



4 ' Faune Kimmerid. du Cap de la Hove' (1863), p. 65, pi. x, figs. 6—8. De Loriol and Pellat, 

 ' Mon. Etages super. Jurass. de Boulogne-sur-Mer ' (1874), p. 42, pi. xii, fig. 14. 



