306 



THE LIAS AMMONITES. 



however, by figure and description, that my late friend was mistaken in this conclusion, 

 and that both are good type forms of well-marked species. 



Locality and Stratiyraphical Position. — The specimens I have figured belonged to 

 my late friend Mr. John Leckenby, F.G.S., and are now in the Woodwardian Museum, 

 Cambridge ; they were collected from the Lower Lias at Robin Hood's Bay ; the speci- 

 men figured in PI. VI, fig. 1, from the same locality, has associated with it in the matrix 

 several fragments of Aegoceras lacuna turn, Buck. Mr. Blake says that this species comes 

 from the middle portion of the Oxynotus-zone. Professor Alcide d'Orbigny's type was 

 collected from the Lower Lias with Gryp/tcea arcuata at Champlong, in the environs of 

 Semur, Cote-d'Or, from whence five examples had been obtained. 



Family.— AEGOCERATITES— continued. 

 Genus II — Aegoceras. Waagen, 1869. 



Family — Capricorni, 



coronarii, 



Arietes, 



Capricornen, 



Ornaten, 



Coronaten, 



Von Buck. Ueber Ammoniten, p. 12, tab. iv, fig. 4, 1832. 



(VOrbigny. Pale'ontologie Franchise, Terr. Cret., i, p. 411, 1841. 



d'Orbigny. lb., p. 414, 1841. 



Quenstedt. Cephalopoden, Kiellose Arieten, p. 72, 1849. 



Quenstedt. Cephalopoden, pp. 80 — 92, 1849. 



Quenstedt, pars. lb. {A. Henleyi, Taylori), p. 132, 1849. 



Quenstedt, pars. lb., (A. pettos, cent aurus), p. 175, 1849. 



Macrocepiialen, Quenstedt, pars. lb., {A. globosus), p. 182, 1849. 



Giebel. Fauna der Vorwelt, iii, p. 537 {A. angulatus), 1852. 



Giebel. lb., p. 659 {A. pettos, Henleyi), 1852. 



Giebel. lb., p. 678, 1852. 



Giebel. lb., p. 692 {A. Taylori, Charmassei), 1852. 



Pictet. Traite de Paleontologie, 2 ed., ii, p. 689, 1854. 



Pictet. lb., i, p. 696 (pars), 1854. 



Seebach. Hannoversche Jura, p. 135, 1864. 



Seebach. lb., p. 135. 



Seebach. lb., p. 136, 1864, 



Seebach. lb., p. 137, 1864. 



Beyrich. Cephalop. aus dem Muschelkalk der Alpen, p. 135, 1867. 



Hyatt. Foss. Cepbalopods of the Museum of Comparative Zoology, 

 Harvard Coll., Cambridge, Mass., p. 72, 1868. See also 

 OPHiocERAS,7^/.Ib.p. 75. Androgxnoceras,//^. lb. p. 83. Cycloceras, Hy. Ib.p. 92. 

 Microceras,^?/. Ib.p.80. Liparoceras, Hy. lb. p. 83. Deroceras, Hy. lb. 81. 

 PERONOCERAS,£fy.Ib.p.85. Coeloceras, Hy. lb. p. 87. Platypleuroceras, Hy. 



lb., p. 92. 

 Aegoceras, Waagen. Formenreihe ; Benecke Beitr., ii, 247, 1869. 



— Mojsisovics. Jahrb. geolog. Reichsanst, p. 576, 1870. 



— Neumayr. Zeit. Deutsch. geol. Gesellschaft, vol. xxvii, p. 905, 1875. 



Amalthei, 



coronarii, 



Capricorni, 



Ornati, 



Capricorni, 



Macrocephali, 



psilonoti, 



Angulati, 



DORSATI, 



Capricorni, 



Psilonoten, 

 Genus — Psiloceras, 



