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SUPPLEMENT TO THE BRITISH 



to me for examination by Mr. Moore are somewhat square, with rounded angles, 

 exteriorly slightly convex, coarsely and irregularly wrinkled. The interior shows four 

 muscular impressions, the upper pair being widely apart. Mr. C. Moore observes that " by 

 its exterior it would be difficult to distinguish this shell from C. antiquioroi the Great 

 Oolite of Hampton Cliff, but the interior of the valves differ. In the C. Saundersii the 

 two pairs of muscular impressions are more widely separated, the lower pair being much 

 stronger and in shape different from those of the C. antiquior, and there is also the 

 absence beneath them of a longitudinal ridge usually present in the latter shell. It is 

 from the Inferior Oolite of Dundry, near Bristol. The shell also occurs in the Inferior 

 Oolite of Minchinhampton, Gloucestershire." 



23. Crania canalis, Moore. Sup., PI. IX, figs. 32 — 35. 



Crania canalis, Moore. The Geologist, vol. iv, p. 97, pi. ii, figs. 8 — 10, 1861. 



Spec. Char. Shell, subquadrate or rounded, wider than long, more or less conical, 

 vertex almost central, and especially so in the young : surface of the unattached valve 

 irregularly marked by radiating ribs, with wider interspaces between them, the ribs 

 projecting likewise to some distance beyond the margin of the shell in the shape of 

 narrow rounded spines. In the interior are seen four principal muscular impressions, the 

 divaricators being situated close to the posterior margin, while the adductors occupy 

 about the central portion of the shell. 



Length 6, breadth 7 lines. 



05s. This species varies a good deal in shape, as may be seen from the figures, and 

 especially so in the number of radiating ridges which ornament its surface. In some 

 specimens there is an approach to symmetry, while in others considerable irregularity 

 prevails. Some young examples are almost circular, while others, aged, are nearly 

 square, with rounded angles. In some perfect specimens measuring five and a half lines 

 in width, the ribs extend two lines in advance of the margin, and their under surface 

 is grooved in all their length. 



Six or eight specimens of this beautiful species were found by Mr. C. Moore in the 

 raggy beds of the Inferior Oolite of Dundry. 



24. Crania Gumberti, E. Bed. Sup., PI. IX, figs. 40, 40 a, b, 41, 41 a. 



Crania Gumberti, Desl. Etudes critiques sur des Brachiopodes nouveaux ou pen 



connus, p. 21, pi. iii, figs. 6 — 10, 1862. 



In his paper " On Abnormal Conditions of Secondary Deposits/' &c, published in the 



