191 



perforated banks of a very characteristic aspect. This is the 

 Great Oohte, properly so called, in the environs of Macon. It 

 is replaced at Tournus by the VOol'ihe hlanche miliare. This 

 rock contains many fossils in the marly beds : — 



Cephalopoda. 



Ammoiiites bullatus, d' Ori. Animonites discus, Sow. 



II microstoma, d'Orb, <• biflexuosus, d'Orb, 



CONCHIPEEA. 



Goniomya an^ulifera, Sow. Lima hippia? d'Orb. 



Pholadomya bellona, d' Orb. Avicula costata. Smith. 



Ceromya peregrina, Ferry. Gervillia acuta, Smv. 



Tliracia viceliacensis, d' Orb, Pecten vagans, Sow. 

 Mytilus Sowerbyanus, d'Orb. </ Luciensis d'Orb, 



Lithopbaga flabella, Best. « rbetus, d' Orb, 



Lima gibbosa, Sotv. « obscurus. Sow, 



" rigidula, Phil. Plicatula cotyloides, Desl. 



Beachiopoda. 



EhyncboneUa spinosa. Sow. Terebratula Buckmani, Dav, 



Terebratula globata, Sow. Tbecidea triangularis, d'Orb. 



Poltzoa. 



Stromatopora dichotoma, Lamx. Spiropora cespitosa, Lamx. 



Berenicea diluviana. Lamx. » compressa, Haime. 



Disastopora Micbelini, Edwards. Alecto dicbotoma, Lamx. 



ECHINODEEMATA. 



Collyrites ovalis, LesJce. Hyboclypus gibberulus, Agass. 



Echiaobrissus clunicularis, Llhwyd. Pseudodiadema Wrigbtii, Cotteau. 

 Holectypus depressus, Larhx. « bomostigma, Ag. 



Collyrites ovalis is always very abundant, and with Rhynchonella 

 spinosa, serves, according to M. de Feeet, to characterize this 

 stratum in the environs of Macon. 



The calcaires marneux a Oursins form a distinct bed persistent 

 in its characters and fossils over an extended area. 



The calcaires a Rhynchonelles are a marly bed, containing 

 Ostrea costata, Terebratula cardium, T. intermedia, Bhynchonella 

 Boueti, Hemicidaris Luciensis, Acrosalenia spinosa, etc. 

 P 



