OF THE PARIS BASIN. 



6i 



Bryozoa* — Although not well represented in the area now 

 under consideration, several species occur in the Sands of the 

 Soissonnais and Calcaire Grossier. We may cite the following : — 



Genus. Sf/ccies. Formation. 



Lunulites radiatiis. Lam. Calcaire Grossier. 



,, urceo/atus, ,, ,, 



Discopora grignonensis, M. EJw. ,, 



Idinonea coronopiis^ Defr. „ 



COELENTERATA. 



AcHnozoa. — The corals of the Paris basin are well preserved 

 and plentiful, notably in the Sables Moyens at Auvers. Some of 

 the characteristic forms are : — 



species. Forvtation. 

 pai-isie7isis, E.&H- 



a-enulata., Galdf. Sab Mo}-. 



Deshayesi.1 Mich. „ 



Solanderj., Defr. ,, 



dffonnis, Mich. ,, 



cariosa, Goldf. ,, 



/rocZ/Z/o/'w/w, Pallas. Calc. Gross. 



iHfundibuHfo7'mis, Sab. Moy. 



Blain\'. 



emaciata, Lam. ,, 



& Calc. Gross. 



raris/ella, Defr. Calc. Gross. 



elliptica, Lam. ,, 



Consult Duncan, Revision of Genera of Corals, Journ. Lin. 

 Sac. (1885). 



Hydrozoa. — Among the earliest known forms of Millepore, 

 Axopora Solanderi, Def., may be quoted as occurring in the 

 Sables Moyens, particularly at Auvers. 



Protozoa. 



Foraininifera. — These are exceedingly numerous and well- 

 developed, and of considerable importance, as we have already 

 seen, in assisting to classify the beds of the Paris basin. Their 

 value in this respect is better recognised, when we bear in mind 

 the fact that the " Nummulitic formations" occupy very large areas 

 in other parts of Europe and Asia. Some of the leading genera 

 occurring are Orbitolites, Nununulites, Alveoiina, Miliola (inclu- 

 ding Bi-,Tri-, and Quinque-loculine forms). The abundant material 

 has not been worked out fully, but the following authors should 

 be consulted : D'Archiac,t Lamarck,;J; Terquem.§ 



* On the Bryo7oa consult, Milne Edwards, Reck, sur ks Polyfiiers /I'ss., Ann. Sci. 

 Nat. (1836), &c. ; and H. Michelin, Iconographie Zoo/yhytologique, Paris (1S40-47). 



t D'Archiac ; Many papers in Mem. Geol. Soc. France, and Bitll. Soc. Geol. Fr. (1835- 

 1868). 



% Lamarck, Antt. du Mus., Paris (1804, 1806, 1807). 



§ Terquem, Les Foraininifircs dc l' Eocene des Enx<. de Paris ; Mrm. Soc. Geol, Fr. 

 3e. ser.,t. ii. (1SS2), Paris. 



