368 FORAMINIFERA OF THE CRAG. 



has been described as having a breadth of 2 — 3 mm. The Crag specimen here 

 figured is 2*5 mm. broad and "83 mm. thick. 



The specimens of Nummulites Boucheri from Sudbourne are, there can be little 

 doubt, " derived " from earlier beds, though in the absence of any positive indica- 

 tion it seems necessary to give it a provisional place in this Monograph. 



Occurrence. — We have no record of the occurrence of this species in the recent 

 condition. It occurs in the Eocene of Biarritz and in the Miocene or Oligocene 

 at Magdeburg and in Hungary. So far as the Coralline Crag is concerned we 

 have nothing to add to the record given in the First Part of the Monograph. 



Sub-family 3. — Cycloclypeinjj;. 



Brady, ' Challenger ' Report, 1884, p. 76. 



Complanate with thickened centre, or lenticular, consisting of a disc of 

 chambers arranged in concentric annuli, with more or less lateral thickening of 

 laminated shell-substance or acervuline layers of chamberlets. Septa double, and 

 furnished with a system of interseptal canals. 



Genus 1. — Orbitoides, d'Orbigny, 1847. 

 Carpenter, ' Introd. Study Foram.; 1862, p^. 298—304. 



Discolithus, Fortis. 



Lycophris, Defrance, Sowerby, Carter. 



Lenticulina, von Schlotheim. 



Asteeiacites, von Schlotheim. 



Nummulites, Boube'e, 



Orbitolites, d'Arcliiac, Conrad, Michelin. 



Orbitulites, Michelin, Bronn, Biitinieyer, Catullo, Bouault, Carter, von Gumbel. 



Orbitoides, d'Orbigny, Carpenter, Carter, d'Archiac, Mayer, von Fritsch, Michelotti, 

 Sowerby, Ahicli, Terquetn, Ehrenberg, von Beuss, Kaufmann, Barker 

 and Jones, Medlicott and Blanford, Butschli, von Zittel, Carpenter, 

 Morton, Seguenza, Karrer, von Qilmbel, von HantJcen, Jennings, 

 Schivager, Martin, Brady, StoliczJca, Steinmann, and others. 



Calcarina, d'Archiac, von Gumbel. 



Htmenoctclus, Bronn, von Gilmbel, Schafhautl, von Schauroth, d'Fichwald. 



Ctci.osiphon, Ehrenberg. 



AsTEBODiscus, Schafhautl. 



