318 Dimorphism of the English Species of Nummulites. 
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Géol. de France,’ sér. 3, vol. 9 (1881), p. 171. 
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DESCRIPTION OF PLATES. 
PuatTE 3. Nummulites laevigatus (Brug.). 
a and a’, median and transverse sections of the megalospheric form (= WV. Lamarcki, 
d’Arch. and Haime). 
b and 0’, median and transverse sections of the microspheric form. All x 4. 
a’, central region of a median section of the megalospheric form. X 38. 
6”, central region of a median section of the microspheric form. % 200. 
Puate 4. Nummulites variolarius (Lamk.). 
m, side view of the test ; a and a’, median and transverse sections of specimens of the 
megalospheric form ; b, median section of a specimen of the microspheric form 
(= WV. Heberti, d’Arch.). All x 24. 
a” and 0’, central regions of sections of the megalospheric and microspheric forms. x 200. 
