306 
INFERIOR OOLITE AMMONITES. 
tte Humphriesianum-zone of Sherborne. He was probably misled by tbe fossil- 
collectors. 
Figs. 8 — 24 of PI. LII fully illustrate the different varieties of this species ; 
and the coronetted first whorl is depicted, considerably enlarged, in fig. 4, 
PI. XLIX. 
i)oESETENSiA PULCHRA, 8. BucJcman. PI. LII, figs. 25 — 27. 
Discoidal, compressed, carinate. Whorls considerably flattened, with almost 
parallel sides, ornamented with sub-direct, ventrally-projected strise.^ Ventral 
area fairly defined, divided by a prominent, well-separated carina. Inner margin 
well-defined, upright. Inclusion one-half. Umbilicus graduated, ornamented 
with numerous, cleanly-cut, direct ribs. Suture-line simple ; the superior lateral 
lobe inclining to be only bifurcate ; the inner lobes, including an array of 
auxiliaries, simple and somewhat elevated. 
The specimen figured is the only example I know. It has considerable 
resemblance to Oppel's Ammonites Bomani,^ but differs therefrom by less com- 
pressed whorls, and a wider umbilicus with well-marked ribs. 
This specimen is exactly the link which connects Edouardiana -y" with 
*' Bomani and it is easily separable from the former by more flatly-sided whorls 
and more pronounced inner margin. Oppel's species shows greater inclusion ; and 
no ribs are depicted in the umbilicus, which means that " earlier inheritance " had 
carried the strige far enough back to obliterate the ribs. 
The Humjjhriesianum-zone of Frogden Quarry, Oborne, furnished me with the 
unique example depicted in PI. LII, figs. 25 —27. 
DoESETENSiA coMPLANATA, 8. Buckman. PI. LIII, figs. 1 — 10 ; PI. LIV, figs. 1, 2. 
1866. Ammonites Eomani, Branns (uon Oppel). Strat. und Pal. des S.-O. 
Theiles der Hilsmiilde; Palffiontographica xiii, 
Lief. 6, pi. xxxvii. figs. 10, 12. 
1881. — 130SCEMSIS (?), ./. Buckman. Termination of Ammonites; 
Quart. Journ. Greol. Soc, vol. xxxvii, p. 65. 
Discoidal, compressed, sub-carinate. Whorls, in the young, gibbous-sided, 
narrow, and thick, but gradually changing with age until they become broad, 
' On the core, obscure, bi'oader, more rib-like markings are observable ; on the test, very 
fine striae. 
2 ' Pal. Mittl.,' pi. xlv, fig. 2. 
