JURASSIC AND TRIASSIC BRACHIOPODA. 227 



; 



Griffin in the zone of Am. spinatus, Middle Lias of King's Sutton, near Banbury. It is 

 an oblong square, wider than long, pyramidal, with four flattened planes converging to a 

 pointed, nearly central vertex. The posterior margin is the broadest part of the shell, 

 and presents a slight inward curve. The lateral margins are nearly straight, and the 

 frontal edge gently convex. Surface smooth, feebly marked at intervals with a few 

 concentric lines of growth. 



Length 4, width 5 lines. 



The internal surface of the valve is partly obscured by the matrix, but the two 

 submarginal, large, muscular scars are clearly observable, separated by a small concave 

 space. 



Obs. — It is not possible, from the inspection of the external surface of a single valve, 

 to be able to point out its real characters and affinities. This shell bears most resemblance 

 to C. Gumberti, E. Desl. (' Bull. Soc. Linn, de Normandie,' vol. vii, pi. iii, figs. 6 — 9, 

 1862), from the Middle Lias of May, Calvados, France, but C. Griffini is a smaller shell, 

 as far as we know, and is less rugose. It is also smoother than C. Gumberti, more 

 regular in shape, and more oblong, the French species being almost square. 



King's Sutton, in Northamptonshire, is a very interesting locality, which has afforded 

 to Messrs. Beesley, Griffin, and Walford many species of Brachiopoda and other fossils. 

 It is there that so many fine examples of Spiriferina oxygona have been collected. 

 Sp. rostrata occurs there likewise, Ter. punctata, T. Edwardsi, Wold, resupinata, Bh. acuta, 

 Bh. tetraedra, Bh. amalthei, Bh. fodinalis, and two or three other species of the last- 

 named genus. 



242. Spiriferina adscendens, E. Best. Dav., Sup., PI. XXIX, fig. 20. 



Spirifer rostratus, Dav. (A. malformation.) Annals and Mag. Nat. Hist., 2nd ser., 



vol. ix, pi. xv, fig. 11, 1852. 

 Spiriferina adscendens, E. Desl. Bull. Soc. Linn, de Normandie, vol. iii, p. 165, 



pi. iv, figs. 7—9, 1858. 



Shell generally irregular and unsymmetrieal, about as long as wide. Dorsal valve 

 semicircular, very convex and small when compared to the ventral one ; mesial fold 

 rounded, not much defined, and gradually blending with the lateral lobes of the valve. 

 Ventral valve irregular, more or less contorted, very large, somewhat pyramidal, and 

 more or less bent backwards at an obtuse or even right angle to the plane of the dorsal 

 valve. Area triangular, very large, flat, and divided in the middle by a long, narrow, 

 elongated, triangular fissure. A deepened sinus extends likewise from near the 

 extremity of the beak to the front. External surface of valves strongly punctated. 

 Length 14, breadth 11, depth 10 lines. 



