304 
INFERIOR OOLITE AMMONITES. 
DoESETENSiA sp. (A). Plate LII, figs. 1 — 3. 
Discoidal, compressed, carinate. Whorls ornamented witli well-marked, direct, 
ventrally-proj acted ribs. Ventral area broad, furnished with a carina, on each 
side of which runs a well-marked sulcus. 
Dr. Haug suggests that this specimen is a young example of his " Karpoceras 
alsaticum.^' I am indebted to my friend for a plaster cast of his typical example; 
and it seems to me a species nearly allied to Witchellia Sutneri (Branco). 
Compared with it my specimen shows decidedly finer ribs, and a complete absence 
of ribs joined on the inner margin. 
It seems to me that my fossil is the parent form of " Edouardiana,''' and it 
shows thicker whorls somewhat more strongly-ribbed. 
Figs. 1 — 8, PI. LII, illustrate the only example I possess. It came from the 
Sauzei-zone of Oborne, Dorset. 
DoRSETENSiA sp. (B). Plate LII, figs, 4 — 7. 
Probably a development of the last species, having broader, more compressed 
whorls, and shallower ventral sulci. 
It has considerable resemblance to the young forms of certain species of 
Witchellia, but is distinguished by its straighter ribs. This is the only example I 
possess. Sauzei'Zone, Oborne, Dorset. 
DoESETENSiA Edguaediana, d'Orhigmj. Plate XLIX, fig. 4 ; Plate LII, figs. 8 — 24. 
I 
1844j. Ammonites Edotjabdiantjs, ^^'OrJzywy. Ceph. Jurass. Pal. Franf., pi. cxxs, i 
figs. 3, 4 (5?). 
1849. — — — Prodrome de Paleontologie, vol. i, | 
p. 262. 
1856. — — Oppel (pars). Jiiraf., p. 370. 
1881. — — J. Buchnaii. Term. Ammonites, Quart. Journ. 
Geol. Soc, vol. xssvii, p. 61. 
1881. Habpoceeas Edouaedianitm, 8. Buchman. Inf. Ool. Amm., ibid., p. 604. 
1885. — Edottaedi, Beitr. Monogr.Ifar/ioceras; Neues Jahrbuch 
fiir Mineralogie, &e., Bl.-Bd. iii, p. 674. 
Discoidal, compressed, carinate. Whorls ornamented with subdirect, ventrally- 
projected ribs. Ventral area ill-defined, carinate and sulcate in the evolute forms. 
