243 



some fine specimens from the Lima beds of the Lower Lias of Warwick- 

 shire; and my friend John Leckenby, Esq., F.G.S., has several fine 

 shells of this species collected from the Lower Lias at Robin Hood's 

 Bay, on the coast of Yorkshii-e. 



Foreign Localities. — Germany, — in Swabia, according to Professor 

 Oppel, it is abundant in the Bucklandi beds of Bodelhausen, Vaihingen, 

 Moringen, and Gmund, and in France from the same zone in the vicinity 

 of Metz, (Moselle,) and Avallon, (Yonne.) 



History. — The history of this species is curious and instructive: 

 towards the end of the 1 7th century it was figured by Plot and Lister 

 in this country, and by Lang and Bourguet on the continent. In 1787, 

 it was first correctly described in the Encyclop^die Methodique by 

 M. Bruguiere as A . bisulcata, he recognized two distinct varieties of the 

 species, one with few ribs, without tubercles; the other with numerous 

 ribs having a tubercle on each. Sowerby, in his Mineral Conchology, in 

 1818, figui-ed the former as A. Bucklandi; the latter, in 1824, as 

 A tnmonites multicostata. Unfortunately this author entirely overlooked 

 the excellent work previously done on Ammonites by M. Bruguiere. 

 In 1830, ZiETEN figured as A. multicostata a good type sjjecimen from 

 the Lias Limestone of Altingen, near Tuttlingen, so that Bruguiere's 

 specific name was nearly forgotten, when M. A. d'ORBiGNY, in his 

 Paleontologie FranQaise, in 1844, gave a liistorical account of this species ; 

 d'ORBiGNY, however confused A. Bucklandi, Sow., with A. lisulcatus, 

 Brug., an error wliich I have endeavoured to rectify in my description 

 of these two forms. 



Ammonites obtusus, Sowerby. (PI. 4, fig. 1, a, b, c.) 



Ammonites obtusus, Sowerby, Mineral Conchology, vol. 2, tab. 167, 

 p. 151, 1817. 

 II Smithii, Soiverby, Mineral Conchology, vol. 4, tab. 406, 



p. 148, 1823. 

 II obtusus, Phillips, Geology of Yorkshire, p. 164, 1829. 



II obtusus, d'Orbigny, Paleontologie Fran^aise ter. Jurassique, 



pi. 44, p. 191, 1842. 

 II obtusus, Chapuis de Dewalque, Fossiles de Luxembourg, 



pi. 4, fig. 3; pi. 5, fig. 1 ; p. 39, 1853. 

 II TuRNERi, Quenstedt, Cephalopoden, tab. 3, fig. 19, p. 77, 1846. 



Shell compressed ; back carinated, carinse obtuse ; aperture rotund-com- 

 pressed, bisinuated above ; whorls subrotund with lateral ribs ; costse, 25 

 Q 



