244 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Maich 24, 



The following are the divisions which we have recognized* : — 



MIDDLE CRETACEOUS. 



1st. Gault, with Amm. Velledce, Beudanti, mammillaris, Rois- 

 si/anus, versicffstatus, and Solarium ornatum. 



2nd. E-hotomagian stage, with Amm. Mantelli, varians, rhoto- 

 magensis, Sca^hites cequalis, and Turrilites costatus. 



3rd. Carentonian stage. Base with Ostrea Jlahellata ; upper part 

 with Inoceramus lahiatus, Pseudodiadema lihycwn, and Ammonites 

 WooUgari (Mant.). (Lower chalk, Ligerian stage, Coq.). 



4th. Angoumian stage, with Badiolites lomhricalis and cornu- 

 pastoris. 



5th. Mornasian stage, marly, with Amm. Bequienianus, and Tri- 

 gonia scabra. 



6th. Erovencian stage, with Hippurites organisans. 



This middle chalk is very admirably developed in the environs of 

 Tebessa, and in the neighbouring Tunisia, as well as in the environs 

 of Batna. 



UPPEE CEETACEOTJS. 



1st. Santonian stage, with Ostrea auricularis, Ostrea acutiros- 

 tris, Lima Hoperi, Ostrea proboscidean D'Arch., Ostrea hippopodium, 

 Ostrea santonensis, and Micraster cor-anguinum. 



2nd. Campanian stage, with Ostrea vesicularis, Ostrea pyrenaica, 

 Leym., Ostrea larva, Ammonites teccanus, Eom., and Inoceramus 

 Crispii, Mant. 



3rd. Dordonian stage, with Badiolites Jouanneti, and Hippurites 

 radiosus, Desml. 



These divisions correspond exactly to those which we have met 

 with in Lower Provence f. 



When we consider that the long series of fossils described as 

 peculiar to Algeria, and belonging exclusively U> the middle and to 

 the upper cretaceous, has been collected by only a few individuals, we 

 shall readily understand that future researches must very extensively 

 increase their number. Indeed, since the publication of my work 



* Description Geologique et Pal^ontologique de la region sud de la Province 

 de Constantine, 1862. 



t The author here gives a complete list of the species of fossils recognized by 

 him as peculiar to the Algerian beds. These are arranged under their different 

 stages, and their numbers are as follows : — 



1. Gault 6 species 



2. Ehotomagian 118 ,, 



3. Carentonian 31 „ 



4. Mornasian 38 ,, 



5. Provencian 10 ,, 



6. Santonian 46 „ 



7. Campanian 22 „ 



8. Dordonian 5 ,, 



Total 276 „ 



As these species are cited from his work on the Geology and PalEeontology of 

 the Province of Constantine, a list of their names would be equally useless to 

 those who do, and to those who do not, possess that work. 



