FROM NORTHWESTERN EUROPE 89 
occur in groups while S. avduennensis occurred as single specimens and was much 
less common. 
Remarks. The name arduennensis first appeared in the literature in 1858 when 
Oppel used it as a “n. sp.” for, “ Rh. inconstans d’Orb. 1848, Prodr. 13 460 (non 
Sow.) ’, in a list of Oxfordian fossils. He gave no description but subsequently 
included it in faunal lists from the ironstone of the Ardennes, as developed at Vieil- 
Saint Remy and Neuvizi, which he was describing together with other localities of 
his Ammonites biarmatus zone. However, he stated that he considered the above 
localities to be possibly of a higher horizon. Oppel’s other citation of the species is 
from the “ Zone des Cidaris florigemma. (Terr. a Chailles und unteres Coralrag) ”’ 
of the Swiss Jura. 
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shell completely 
silicified 
Ree / 
Fic. 32. Transverse serial sections of Septaliphoria avrduennensis (oppel). Oxfordian. 
“ Terrain & Chailles’’. Pagny-sur-Meurse (Meurthe et Moselle), France. ( 3). 
