TEREBRATULA. 53 



inspecting the original specimens. Its exact stratigraphical age is the Cornbrash, as 

 distinctly stated by Sowerby, still we find it placed by Von Buch, 1 Dr. Mantell, 2 and 

 others, in the chalk; some state it to be from the Lias, Great Oolite, Oxford clay, &c, 

 but it is singular few place it in its true stratigraphical position, 3 nor do I believe Zieten's 

 figures referable to this species. Ter. intermedia bears some resemblance to Ter. perovalis, 

 some specimens are indistinguishable ; the common type differing, however, from the 

 Inferior Oolite specimens, in being wider and more regularly circular, especially towards 

 the beak and hinge margin : when young it is almost circular, without biplication, which 

 only appears at a more advanced age, and it may be remarked that it is impossible to 

 determine to what species some young shells belong, from the great resemblance they bear 

 to each other, specific distinctions only appearing at a more advanced period of growth. 

 The name of intermedia is well chosen, as its characters are intermediate, and lead us to 

 such shapes as Ter. Phillipsii and globata ; from the first it is distinguished by its more 

 circular form, and from the last in being more depressed, and is a much larger shell. 

 Lamarck's Ter. intermedia appears to be a Rhynchonella, otherwise his species could not 

 hold priority over Sowerby 's, published in 1802. 4 



Ter. intermedia is abundantly found in the Cornbrash of Stanton, in different parts of 

 Wiltshire, Rushden, &c, associated with Ter. lagenalis, obovata, Bentleyi, &c. Many fine 

 specimens are to be seen in the collection of the British Museum, and in the cabinets of many 

 collectors ; it was found also by M. Bouchard in the neighbourhood of Boulogne-sur-mer. 

 PL XI, fig. 1, 3, in the Collection of Mr. Morris ; fig. 2, in that of Dr. Wright ; fig. 5, in 

 the British Museum. 



50. Terebratula Phillipsii, Morris. Plate XI, figs. 6 — 8. 



Terebratula Phillipsii, Morris. 1847. Annals and Mag. of Nat. Hist., p. 255, 



pi. xviii, fig. 9. 

 — — D'Orb. 1849. Prodrome, vol. i, p. 287. 



Diagnosis. Shell elongated, irregularly pentagonal, posterior half of the shell and 

 beak tapering, truncated by an entire moderately large and rather oblique foramen, sepa- 

 rated from the umbo by a deltidium wider than high ; lateral ridges obtuse and indistinct ; 

 large valve more convex than smaller one, with a somewhat incurved and produced beak ; 

 smaller valve with two rounded costae, commencing about the middle and continued to the 

 margin, with a broad deep mesial furrow or sinus, and two lateral ones ; front deeply 

 sinuous, surface punctuated. Length 28, breadth 20, depth 13 lines. 



1 Von Buch. 'Mem. Soc. Geol. de France,' vol. iii, l ero Serie, 1838, where it is placed as a synoi^me 

 of Carnea. 



2 Dr. Mantell. ' Fossils of South Downs.' 



3 See D'Orbigny's 'Prodrome;' Morris's Catalogue, p. 133. 



* See Davidson's Notes on an Examination of Lamarck's Species of Fossil Terebratulse, 'Annals and 

 Mag. of Nat. Hist.,' June 1850. 



