ZONE OF AEGOCERAS JAMESONI. 



69 



8. The Zone of Aegoceras Jamesoni. 



Synonyms. — " Micaceous marl," in part, De la Beche's section. " Numismalismergel 

 oder Belemnitenuiergel," Quenstedt, 'das Flotzgebirge Wiirttembergs,' 1843. "Die 

 Schichten des Ammonites Jamesoni'' Oppel, 'Die Juraforniation,' p. 118, 1856. " Lias 

 Gamma," pars, Quenst., ' Der Jura Uebersichtstafel,' p. 293, 1858. " Jamesoni-bed," 

 Wright, 'Quart. Jour. Geol. Soc.,' vol. xvi, p. 25, 1858. "Die Schichten des Amm. 

 Jamesoni" Brauns, ' Untere Jura,' p. 100, 1871. " Zone of Ammonites Jamesoni" Tate 

 and Blake, 'Yorkshire Lias,' p. 78, 1876. 



Gloucestershire. — Upwards of twenty years ago I collected several fragments of the 

 whorls of a large Aegoceras Jamesoni in some deep brick-pits near Leckhampton, which 

 was the first evidence we had that this zone existed near Cheltenham. Since that time 

 I have accumulated many of the leading fossils of the beds, and important additions 

 have from time to time been made by Professor Tate, all of which are now recorded 

 in the following list : 



Cephalopoda. 



Aegoceras armatutn, Sow. 



— brevispina, Sow. 



— striatum, Reinecke. 



— Ilenleyi, Sow. 



— Ijoscoml)i, Sow. 



— Jamesoni, Sow. 



— Maiigeiiesti, d'Orb. 



— Valdani, d'Orb. 



— pettos, Quenst. 



Cerithium armatum, Miinst. 

 Chemnitzia Blainvillei, Miinst. 



— liassica, Quenst. 

 Cryptsenia expansa. Sow. 



Astarte striato-sulcata, Rom. 

 Avicula novemcostae, Brown. 



— substriata, M'dnst. 

 Cardinia crassissima, Sow. 

 Cypricardia cucullata, Miinst. 

 Cucullsea Munsteri, Goldf. 

 Isocardia cingulata, Goldf. 

 Inoceramus ventricosus, Sow. 



— eubstriatus, Goldf. 

 Leda acuminata, Goldf. 

 — Galatea, d'Orb. 

 Nucula cordata, Goldf. 



Aegoceras Taylori, Sow. 

 Arietites Nodotianus, d'Orb. 

 Lytoceras fimbriatum, Sow. 

 Belemnites acuarius, Schloth. 



— apicurvatus, Blainv. 



— breviformis, Voltz. 



— elongatus, Sow. 



— Milleri, Phill. 



— clavatus, Schloth. 



Gasteropoda. 



Dentalium minimum, Strick. 

 — elongatum, Miinst. 

 Phasianella paludiuaria, Miinst. 

 Trochus Thetis, Miinst. 



Lamellibranchiata. 



Opis Carusensis, d'Orb. 

 Pecten liasinus, Nyst. 



— acutiradiatus, Goldf. 



— personatus, Miinst. 

 Pholadomya decorata, Hartm. 

 Plicatula spinosa, Sow. 



— alternans, Deslong, 

 Mytilus scalprum. Sow. 

 Pinna folium, T. ^ B. 

 Gryphaea obliquata. Sow. 



— cymbium, Lamk. 

 Limea acuticosta, Goldf. 



