294 Frederick Cluqjinan : 



Auiphistegina lesson ii, d'Orbigny, PI. III., Fig. 6. 



A. lessojiii, d'Orbigny, 1826, Ann. Sci. Nat., vol. VII., p. 304, 

 No. 3, pi. XVII., Figs. 1-4 A. hmterina, Id, 1846, 

 Foram. Foss. Vienne, p. 207, pi. XII., Figs. 3-5. A. camp- 

 helli, Karrer, 1864, Novara Exped., Geol. Theil, vol. I., 

 p. 84, pi. XVI., Fig. 18. A. ancMandica, Id., 1864, 



ibid., p. ^r,^ pi. XVI., Fig. 19. A. lessonii, d'Orb., Brady, 

 1884, Rep. ChalL, vol. IX., p. 740, pi. CXL, Figs. 1-7. 



The majority of specimens found in the Batesford limestone 

 are of the compressed lenticular variety, as typified in A. 

 hauerina of the Vienna Miocene, and some examples attain a 

 fair size, often as much as 2.5mm. in diameter. They are fre- 

 quently so nearly equilateral as to closely resemble the small 

 species of Nummulites like N. variolaria. The resemblance, 

 however, is only external, since a cross-section reveals the un- 

 equal umbilical cones and the one-sided alar overlap of the 

 septal margin. 



A. lessonii is verv common in the upijer portion of the beds, 

 the polyzoal rock, taking the place of the Lepidocyvliuae of the 

 lower beds. Both Quarries. 



ptrculina coin pJanata. Defrance sp. 



Lenticulites coniplanata, Defrance, 1822, Die. Sci. Nat., vol. 

 XXV. p. 453. Operculina complanata, Defr. sp., Brady, 

 1884, Rep. Chall, vol. IX., p. 743, pL CXIL, Figs. 3, 4, 

 5, 8. 



Occasional ; in the limestone of the P^'ilter (^)uarrie8 and in 

 the Upper Quarry. 



Optrrulina coniplanata, Defr. sp., var. (jranuloxa, Leymerie. 



ptrcvli na (jranulosa . Leymerie, 184(), Mem. Soc. Geol. France, 

 ser. 2, voL I., p. 359, pi. XIII.. Figs. 12^/, h. 



Tests very finely granulate. The septa occasionally evince a 

 tendency to bifurcate near the peripheral border, after the man- 

 ner of riettroHtec/ina. Fre<iuent. In the Filter (^Uiarries and 

 the Upper Quarry. 



