ARIETITES BISULCATUS. 275 



cuttings of the Bristol and Birmingham Railway near Breclon, at Fretherne-on-Severn, 

 Coombe Hill, Purton-on-Severn, 1 and several other localities in Gloucestershire ; Weston, 

 near Bath ; Saltford, near Bristol ; Lyme Regis, Dorsetshire ; and Robin Hood's Bay, 

 Yorkshire. 



Foreign Localities. — It characterises the Lower Lias in the Zone of Gryphcea arcuata 

 in many Departments in France, as Cher, Jura, Ain, Meurthe, and Cote-d'Or ; in Swabia 

 it is collected at Vaihingen, Mohringen, Bebenhausen, and Nurtingen : for the other 

 countries in Europe in which it is found the reader is referred to the table of synonyms. 



History. — First figured by Sowerby, afterwards by Zieten, d'Orbigny, von Hauer, 

 and Buckland. Their Plates are all good, and leave but little to be desired. 



Arietites bisulcatus, Bruguiere. Pis. Ill and IV. 



Robert Plot's Natural History of Oxfordshire, tab. 5, fig. 14, p. 110, 1677. 

 Martin Lister. Historia Anglia?, de Lapidibus turbinatis, tab. vi, fig. 3, p. 207, 1678. 

 Bourguet. Traite des Petrefications, pi. 41, No. 270, 1742. 



Ammonites bisulcata, Bruguiere (pars). Encycloped. Method., t. i, p. 39, 



No. 13, 1792. 



— multicostata, Sowerby. Mineral Conchology, vol. v, p. 76, tab. 454, 



1824. 



— — Zieten. Versteinerungen Wurttembergs, p. 35, tab. xxvi, 



fig. 3, 1830. 



— bisulcatus, cFOrbigny. Paleontologie Franchise, Ter. Jur., p. 187, 



pi. xliii, 1842. 



— multicostatus, Quenstedt. Die Cephalopoden, p. 80, 1846 — 9. 



— — Quenstedt. Handbuch der Petrefactenkunde, p. 355, 



1852. 



— bisulcatus, Chapuis et Dewalque. Foss. Terr. Second. Luxembourg, 



p. 42, pi. v, fig. 3, 1853. 



— — von Hauer. Die Cephalopoden aus dem Lias Nordost. 



Alpen, p. 14, pi. i, figs. 3, 4, 1856. 



— — Oppel. Die Juraformation, p. 77, 1856. 



— multicostatus, Quenstedt. Der Jura, p. 67, tab. vii, fig. 2, 1858. 



— — Terquem et Piette. Lias Inf. de 1' Est de la France, p. 26, 



1865. 



— bisulcatus, Dumortier. Depots Jurass. du Basin du Rhone, torn, ii, 



p. 20, pi. iii, figs. 1—3, 1867. 

 Arietites — Tate fy Blalce. Yorkshire Lias, p. 283, 1876. 



Diagnosis. — Shell depressed, discoidal ; siphonal area tricarinated ; whorls subquadrate, 

 with thirty to forty strong, sharp, bent ribs, having a tubercle near the siphonal margin 

 of each ; median keel strong, with two sulci and two lateral carina? ; aperture subquad- 

 rate, bisinuated anteriorly ; lateral septa with three lobes. 



1 'Proceedings of the Cotteswold Club for 1863,' p. 135. 



