TEREBRATULA. 55 



myself took much trouble in minutely comparing a vast number of specimens, forwarded to 

 me from different quarters, with the types of Mr. Sowerby's collection 5 we also compared 

 it with the origiual Ter. sphceroidalis and T. hullata, which some authors (Bronn, ' Index,') 

 have considered synonyms of globata, while others (D'Orbigny, 'Prodrome,') separate 

 T. spharoidalis, and place hullata as a synonym of globata ; lastly, M. Deslongchamps 

 places T. hullata and sphceroidalis as synonyms, and separates globata. We are disposed 

 to adopt this view, and to consider T. hullata as a variation of sphceroidalis. It possesses 

 more of the characters of this last than of globata ; its margin is scarcely sinuated, and 

 wants those defined costae and well-marked sinuses characteristic of the species under 

 consideration. It may be said that hullata is a connecting link between globata and 

 sphceroidalis, but more nearly allied and more properly placed as a variation of the last- 

 named type. 



Ter. globata is abundantly found in the Inferior Oolite of Dundry, Cheltenham, 

 Nunney, near Frome, &c, and fine specimens are preserved in the British Museum, that 

 of the Geological Survey, Bristol Museum, and collections of Messrs. Walton, Buckman, 

 Sowerby, and Dr. Wright. PI. XIII, fig. 2, 3, from the Collection of Mr. J. de C. 

 Sowerby ; fig. 5, from that of Mr. Walton. 



52. Terebratula bucculenta, Sowerby. Plate XIII, fig. 8. 



Terebratula bucculenta, Sow. 1825. Min. Con., vol. v, p. 54, tab. 438, fig. 2. 



— — D'Orb. 1849. Prodrome, vol. i, p. 3/6 ; vol. ii, p. 24. 



— — ? Zieten. 1832. Die Verst. Wurttemb., t. 39, fig. 6. 



— — Deslongchamps. 1837. Soc. Lin. de Normandie. 



Diagnosis. Shell inequivalved, elongated, irregularly oval ; valves almost equally con- 

 vex ; beak small, recurved, truncated by a small foramen almost touching the umbo, and 

 concealing the deltidium; lateral ridges indistinct; margin of valves almost straight, 

 front slightly produced, and laterally compressed or pinched ; surface smooth and punctu- 

 ated. Length 13, width 12, depth 8 lines. 



Obs. I am indebted to Mr. J. de C. Sowerby for the loan of the original specimens 

 illustrated in Plate XIII, fig. 8, obtained from Coralline Oolite or Calcareous Grit of 

 Malton, and, according to M. D'Orbigny, 1 it would likewise occur in the Oxford clay, which 

 is not unlikely, as several species have been found in both deposits. Von Buch, 2 Morris, 3 

 Brown, 4 and others, believe it to be only a synonym of T. hullata, Sow., but I am not 

 prepared to admit the fact, as T. bucculenta appears to differ from any true specimens of 

 Ter. hullata and steroidals, a species peculiar to the Inferior Oolite of many localities. 



1 D'Orbigny. 'Prodrome,' 1849. 



2 'Mem. Soc. Geol. de France,' vol. Hi, l ere S6rie, 1838, p. 195. 



3 Morris. Catalogue, 1843, p. 132. 



* Index Palseontologicus, vol. ii, p. 1231. 



