TEREBRATULA. 53 



Plate II, figs. 29, 29°. A specimen from the Lower Green Sand of Hythe. 



,, figs. 30, S0 abcd . From the Lower Green Sand of the same locality, in the 



collection of Mr. Morris. 

 „ figs. 31, 31 ab . From the Green Sand of Farringdon, in the collection of 



Mr. Cunnington. 

 „ figs. 32, 32 a b . From the Upper Green Sand of Warminster, in the collection 



of Mr. Cunnington. 



21. Terebratula obesa, Sow. Plate V, figs. 13 — 16. 



Terebratula Obesa, Sow. Min. Con., vol. v, p. 54, tab. 438, fig. 1, 1825. 



— — Fleming. A Hist, of Brit. An., p. 371, 1828. 



— — Brown. Must, of Foss. Conch., p. 133, pi. liv, figs. 28, 29, 1838. 



— — ? Roemer. Die Vers. Nord. Kreid., p. 43, 1840. 



— — Morris. Catalogue, p. 134, 1843. 



— — Tennant. A Strat. list of Brit. Foss., p. 47, 1847. 



— — VOrbigny. Pal. Franc. Ter. Cretacees, vol. iv, p. 101, pi. 513, 



figs. 1—4, 1847. 



Diagnosis. Shell irregularly ovate, oblong, very convex, straight or slightly indented 

 in front ; beak short, incurved, truncated by a large circular foramen lying close to the 

 umbo, so that the deltidium is rarely exposed ; beak ridges indistinct ; margin line wavy ; 

 imperforated valve less convex than the dental one, presenting a very gentle longitudinal 

 curve from the beak to the front ; the central portion of the valve is nearly flat, with a 

 slight longitudinal depression towards the front, giving rise to two lateral obtuse plaits ; 

 larger valve almost uninterruptedly convex ; front elevated ; surface smooth, marked with 

 concentric lines of growth ; structure punctuated ; loop short, wide, anneliform, and con- 

 fined to the posterior portion of the shell, not exceeding a third of the length of the valve ; 

 simply attached to the crural base, the two riband-shaped lamellae are soon united by a 

 transverse lamella bent upwards in the middle ; dimensions variable ; the largest specimen 

 known measures length 2^ inches, width 2 inches, depth 1^ inch. 



Obs. This is our largest British Cretaceous Brachiopoda, described in 1825 by Sowerby, 

 under the name of T. obesa, and cannot be said to be common ; indeed we believe it so 

 closely allied to Ter. Butempliana} (D'Orb.), by all its most important characters, that it 

 may probably be only the giants of that form, and I have no doubt that all the passages 

 linking them together may be easily obtained ; but Palasontologists seem anxious to retain 

 both names, the present one for those very convex shells illustrated in our Plate V; we 

 place them, therefore, under distinct heads while retaining our opinion as above. One of 

 the most marked characters of this species is its large and edged foramen, which 



1 T. Butempliana is a shell known under the name of Ter. biplicata. Sow., but that name had been given 

 to another species byBrocchi in 1814. 



