ARIETITES BISULCATUS. 275 



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

 Coombe Hill, Purton-on-Severn,^ 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 Gryplicea 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 Niu'tingen : 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. HI and IV. 



Robert Plot's Natural History of Oxfordshire, tab. 5, fig. 14, p. 1 10, 1677. 

 Martin Lister. Historia Anglias, 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 Wiirttembergs, p. 35, tab. xxvi, 



fig. 3, 1830. 

 •^ BisuLCATDS, (TOrbigny. Paleontologie Fran9aise, 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 Bewalque. 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, Bumortier. Depots Jurass. du Basin du Rhone, torn, ii, 



p. 20, pi. iii, figs. 1—3, 1867. 

 Arietites — Tate 8f Blahe. 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 carinas ; aperture subquad- 

 rate, bisinuated anteriorly ; lateral septa with three lobes. 



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



