102 BRITISH CRETACEOUS BRACHIOPODA. 



by himself at Essen, I became convinced that this long hinge line was exceptional, and that 

 the true characters of the species are similar to those assumed by A. megatrsma, Sow., 

 or intermediate between figs. 32 and 34, five or six examples of the last having been 

 discovered by Mr. Carter in the Upper Green Sand near Cambridge. 



Plate XII, fig. 31. The original figure of Terebratula Megatrema, Sowerby, from 



the 'Geological Trans.,' 1 vol. x. — Fig. 31 a . An enlarged 

 illustration. 

 ,, fig. 32. A specimen from the Upper Green Sand of Warminster, in the 



Bristol Institution Museum. — Eig. 32 s b . Enlarged figures. 

 ,, fig. 34. A British example, from the Upper Green Sand of Cambridge, 



in the collection of Mr. Carter. — 34" bc , enlarged. This specimen 

 shows the intercalated ribs. 

 „ fig. 35. Rcemer's published figure of Ter. decemcostata considerably 



enlarged, from the Green Sand of Essex, and introduced 

 here to facilitate comparison. 

 ,, fig. 36. Another example from the same locality, drawn by M. de 



Hagenow. — 36 a , enlarged illustration. 



Argiope Bronnii, Be Hagenow, Sp. Plate III, figs. 1 — 13, and Plate XII, figs. 37, 38. 

 (Described as Argiope decemcostata, Roemer, in p. 16 of the present Monograph.) 



Orthis Bronnii, V. Hag. Neuv. Jahrb. F. Mineral, pi. ix, fig. 7, 1842. 



— Buchii, V. Hag. lb., pi. ix, fig. 8, 1842. 

 Terebratula Duvalii, Dav. London Geol. Journal, p. 113, pi. xviii, figs. 15 — 18, 



1847. 

 Megathyris cuneiformis, D'Orb. Pal. Franc., Ter. Cretaces, vol. iv, p. 147, pi. 521, 



figs. 1—11, 1847. 



Having already fully described this species, I will simply remark that it is found in the 

 Upper Chalk of Northfleet, Gravesend, Meudon (France), and in Prussia. It possesses in 

 general fewer ribs than the Upper Green Sand species, and its dorsal valve is likewise less 

 convex. M. de Hagenow having kindly presented me with specimens of both his 

 A. Bronnii and A. Buc/iii, I was able to convince myself that they belong to a single 

 species, identical in shape and character with those found in England and France; and to 

 facilitate comparisons, I have reproduced, in Plate XII, the original published figures 

 of M. de Hagenow's two species. 



Plate XII, fig. 33. Illustrates the only specimen of Argiope hitherto discovered in the 



Lower Chalk of Kent (British Museum). 

 „ fig. 33 a . A magnified illustration of the same. 



1 Sowerby describes his species, as follows : — Ter. megatrema : moderately convex, transversely 

 obovate, with a few distinct ribs. The beak is large and produced with a very large perforation, whence 

 the name. 



