SUPPLEMENT.— DENCKMANNIA. xvii 



III. Genus — Denckmannia, 1 8. Buckman. 

 (Type: Denckmannia iumefacta, sp. n.) 



Definition. — Stenopachygyral, sublatumbilicate, crassornate, tuberculate, septi- 

 carinate, pauciseptate. 



Distinction. — So far as the type species of the genus is concerned it is distin- 

 guished from Lillia by less compression being coupled with smaller umbilication 

 and more pronounced ornamentation. The species grouped with Denckmannia ? 

 iserensis are even more separated by the robustness of their ornamentation. 

 They show in a marked degree a rursicostate character, and are really quite 

 separable from the true Denckmannia. The only feature which they possess in 

 common therewith is a robustness of ornament. 



1. Denckmannia? iserensis (Oppel). Suppl., Plate II, figs. 1, 2. 



185G. Ammonites iserensis, Oppel, Juraf., p. 249. 



1874. — eebaensis, Dumortier (uon Hauer), Etudes pal. Bassin du 



Rhone, iv, pi. xxiii. 

 1S93. Lillia iserensis, Bonarelli, Osservazioni sul Toarciano, &c, Boll, della 



Societa geol. italiana, vol. xii, fasc. 2, p. 12 (pars). 



Description. — Stenopachygyral, latumbilicate, subirregulari-crassornate, nodate, 

 rursi-recticostate, septicarinate (?). 



Note. — The above description is drawn up from Dumortier's figure. In all 

 probability the species is septicarinate, and there has been the usual mistake in 

 the delineation of the carina. Dumortier's specimen is chosen for the type for 

 the reasons given under the historical remarks. The specimen now figured is 

 considered to be a fragment of a larffe adult. 



History. — Under the name Am. iserensis, Oppel separated, as distinct from 

 " Am. comensis," a species which he said reached a foot in diameter, and was not 

 uncommon in the ironstone of la Verpilliere and St. Quentin ; it was found 

 frequently at Milhau, and occurred in Swabia. He described it as having a 

 nearly quadrate " aperture," ribs coarse and thick on the outer whorls, a broad 

 keel, and an appearance like Amm. Gonyhearei or Bucklandi, &c. Unaccompanied 

 by any figures, or by any measurements, or by any description of the septa, 



1 In honour of Dr. August Denckmann, whose work has frequently been referred to in these pages. 







