ORBITOIDES ASPERA. 369 



DlSCOCYCLINA, RHIPIDOCYCLINA, AkTINOCTCIjINA, Asterocyclina, Lepido- 



ctclina, von Giimbel. 

 Nummulina, Bronn, Riitimeyer, d'Archiac. 

 Numismale, Faujas de St. Fond. 

 Lenticulites, von Schlotheim. 



General Characters. — Shell lenticular, consisting (firstly) of numerous chambers 

 arranged in concentric annuli, in one plane round a central primordial chamber 

 (large or small) ; and (secondly) of numerous layers of flattened chamberlets 

 disposed more or less regularly on each face of this median plane. 



1. Okbitoides aspera, Giimbel, 1868. Plate III, fig. 25 (0. Faujasii). 

 Part I, 1866 (Orbitoides Faujasii), Appendices I and II, Tables, No. 100. 



Oebitolites sttbmedia (part), d'Archiac, 1846. Mem. Soc. Geo). France, ser. 2, 



vol. ii, mem. No. iv, pi. B (vi), 

 figs. 6, 6 a. Named on the 

 plate only. According to 

 von Giimbel. 

 — Pratti (part), Michelin, 1840-47. Iconograph. Zooph., p. 278, 



pi. lxiii, fig. 14. According 

 to von Giimbel. 

 Obbitulites convexo-convexa (?), Catullo, 1857. Terr. Sedim. Super. Venezia, 



p. 25, pi. i, fig. 7. Accord- 

 ing to von Giimbel. 

 Okbitoides (Discocyclina) aspera, Ounibel, 1868. Abhandl. k. Bayern. Akad. 



Wiss., vol. x, p. 698, pi. iii, 

 figs. 13, 14, 32-34. 



— aspera, Ranthen, 1875 (1881). Mitth. Jahrb. k. TJng. Geol. Anst., 



vol. iv, p. 82, pi. xi, fig. 4. 

 — Schwager, 1877. Boll. R. Com. Geol. Ital., vol. viii, p. 26, 

 fig. 77. 



— — Jones, 1882. Catal. Foss. Foram. Brit. Mus., pp. 34, 41, 42. 



Characters. — Lenticular, biconvex, surface very rough and warty ; median 

 chambers almost square in section. The Bavarian specimens range to 8 and 

 12 mm. in breadth. Our figured specimen is 4 mm. broad. 



Occurrence. — The genus may be said to be characteristic of the Upper 

 Cretaceous and of the Lower and Middle Tertiaries. Professor von Giimbel refers 

 to this species as having been found at Hammer, Gotzreuth, Kressenberg, and 

 Schoneck in the Bavarian Alps ; near Biarritz in South France ; near Mosciano, 



