236 



On the Ammonites of the Lias Formation. By Thomas Wright, M.D., 

 F.RS.E., F.G.S. ( Continued Jrom page 179 J 



Ammonites Conybeabi, Sowerby. (PL 3, fig. 2, 3.) 



A. CoNYBEARi, Soiverhy, Mineral Concliology, tab. 131, p. 70, 1816. 



Sedgioick dj Murchison, Trans. Geol. Soc. Lond., 2ud 



series, vol. 3, p. 312,1830. 

 Zietm, Die Versteinerangen Wiirtembergs, tab. 26, fig. 

 2, 1831. 

 „ Hoffman, Karstens Archiv. 13, p. 267, 1840. 



„ Zeuschner, v. Leonhard, und Bronn's Jahrbuch, p. 429, 



1842. 

 „ d Orligny, Paleontologie Fran^aise ter. Jurassique, pi. 50. 



p. 202, 1843. 

 Pilla, Saggio compar. dei ter. d'ltalia, p. 70, 1845. 

 Lardy, v. Leonhard, und Bronn's Jahrbuch, p. 210, 1846. 

 Bzio de Vechi, Bulletin Soc. Geol. Fran., 2nd series, torn. 



4, p. 1079, 1847. 

 Quenstedt, Cephalopoden, p. 80, tab. 3, fig. 13, 1849. 

 *Sr«m e Meneghini, Consider, sulk Geol. della Toscana, p. 



72, 1851. 

 „ Buch, V. Leonhard, und Bronn's Jahrbuch, p. 316, 1851. 



Renevier, Bulletin de la Soc. Vaud. sci. nat. torn. 3, p. 



139, 1852. 

 Merian, Verhandlungen der naturf. Ges. in Basel, p. lol, 



1852. 

 „ Escher, v. Leonhard, und Bronn's Jahrbuch, p. 167, 1853. 



Studer, Geologic der Schweiz, vol. 2, p. 30, 1853. 

 „ Oj^pel, die Jui-aforraation, p. 69, 1856. 



Hauer, uber die Cephalopoden der nord. Alpen, tab. 2. 



p. 16, 1856. 



„ Qmnstedt, der Jura, p. 78, 1858. 



i)my«om.-Shell discoidal, much compressed ; back tricarinated ; whorls 



numerous, 8 to 10, slightly involute and numerously costated ; costae in 



adults from 40 to 60 in a whorl, small, round, obUquely arcuate, and 



