j 32 HALKYARD, Fossil Foraminifera of the Blue Marl 

 SUB-FAMILY NUMMULITINJE. 

 Genus Amphistegina, d'Orbigny. 



328. Amphistkoina lessonii, d'Orbigny. 



PL VII, fig- 7- 

 Amphistegina lessonii, d'Orbigny, 1826, Ann. Sci. Nat. vol. 



VII, P. 304, No. 3, pi. XVII, figs. 1-4. 

 Amphistegina lessonii. Brady, 1884, Chall. Rep. vol. IX, p. 740, 

 pi. CXI, figs. 1-7. 



Rather rare. The specimens are all of the thick very 

 inequilateral type, and on the inferior surface the whole of the 

 segments are generally visible. 



Genus Operculina, d'Orbigny. 



329. Operculina complanata, (Defrance). 



Lenticulites complanata, Defrance, 1822, Diet. Sci. Nat., vol. 



XXV, p. 453. 

 Operculina complanata, Brady, 1884, Chall. Rep. vol. IX, p. 743 



pi. CXII, figs. 3-5-8. 



329A. [Operculina complanata, var. granulosa, Leymerie.] 



[Operculina granulosa, Leymerie, 1846, Mem. Soc. Geol., 

 France, ser. 2, vol. I (1884), p. 359, pi. XIII, fig. 12 a, b, 

 c. 



Operculina complanata var. granulosa. Brady, 1884, Chall. 

 Rep. vol. IX, p. 743, pi. CXII, figs. 6, 7, 9, 10.] 



Frequent and fairly well distributed. Between the typical 

 smooth form and the beaded variety granulosa there is such 

 a graduated series that I have included all specimens found 

 under the type, though well-marked examples of the orna- 

 mented variety occur fairly numerous. 



(All the specimens, both of the species and of its variety 

 granulosa are of the thin complanate type.) 



NUMMULITES. 



(Halkyard has identified and described a large number of 

 Nummulites and Orbitoides from the Biarritz material, both in 

 isolated species and in megalo-and microspheric pairs. It is 

 clear from the correspondence in our hands that he took great 

 pains to obtain verification of his identities from several authont- 



