494 
exposing the embraced whorls ; ventral surface (or back) obtusely rounded ; keel 
prominent, erect, and rounded. In the septa the siphonal lobe is sliort and broad, 
almost plain-margined; ventral lobe rather deep; ventral saddle broad, of two chief 
portions, deeply divided at their sides, each being again subdivided at their apices ; 
superior lateral lobe deep, and UTiequally subdivided, being tripartite ; first lateral saddle 
short and bifurcate ; inferior lateral lobe short, with two lateral and two terminal 
divisions ; second lateral saddle resembling the first ; the whole occupying about three 
and a-quarter ribs, pectinations strong. The transverse ornamenting eostfe are 
tubcrculated, frequently bifurcating, the division in each case taking place clear of the 
umbilical cavity ; the largest tubercles are along the sides of the back, and are them- 
selves transversely crenulated, whilst those around the umbilical edge are also very 
prominent ; on the embraced whorls a single row of tubercles is visible, the intercostal 
surfaces are finely transversely striate. 
Ohs. A careful comparison with authenticated specimens of Ammonites injlatus 
leaves little doubt that we have in the Queensland fossils a variety very closely 
assimilating to the parent species ; the only difference I am able to point out lies in the 
possession of a rather narrower back, the space between being more acute than in the 
type form. So much variation occurs amongst Keocomian Ammonites, especially as 
regards age and locality, that the foregoing points, other characters being equal, can 
hardly debar the Queensland shells from being placed in this species. This variation in 
the keel gives to the general outline a more acutely quadrangular shape. The form 
otherwise, ornament, and general features are particularly alike in the fossils of the 
two hemispheres, but the figures given by the late Dr. Stoliezka of A. injlatm from the 
Indian Ootatoor Group, even bear closer resemblance to the Australian variety than do 
those of the species proper from Europe. 
A fragment of an Ammonite (PI. 34, fig. 4), collected at Aramac by the late Mr. 
James Smith, is also probably referable to Ammonites injlatus, as there are traces of 
strong tuberculated costae, and tubercles around the umbilical edge. 
It is again possible that a small Ammonite represented in PI. 42, fig. 12, may 
be this species, although the cost® are more sigmoidally bent. This is an impression on 
the fractured cnd-surface of a bore-core, and the impression is one inch in diameter. 
The w'horls are few, and there is a forward prolongation of the ventral edge into a well- 
marked rostrum. The flanks bear coarse, strong, sigmoidal ridges, with here and there 
smaller interpolations. The form of the back is unknown. In addition to a general 
resemblance to A. injlatus, this little Ammonite recalls to mind such forms as A. denanusi 
Shy., A. lautus, Parkinson, and other Cretaceous species. 
Loc. North-east end of Glanmire Block, seventeen miles south-west of Tambo 
{Mr. Qoffage) ; Aramac, PI. 34, fig. 4 {The late James Smith) ; Warriana Bore, 
at a depth of three hundred and seventy-five feet, twenty-eight miles from Hughenden, 
on the Win ton Hoad (J. B. Henderson) . 
Section— HAPLOCERAS. 
AiiMOjfiTEs Elindeesi, McCoy, PI. 30, figs. 1-3. 
Ammonites Flindersi, McCoy, Ann. and Ma". Nat. Hist., 1866, xvi., p. 331 ; Ibid., 18G7, xx., p. 196. 
„ „ McCoy, Trans. R. Soc. Viet., 1866, vii., p. ,61 ; Ibid., 1868, viii., Ft. 1, p. 42. 
„ Bcudanti, var. MitchelH, Etheridge, Quart. Journ. Geol. Soe., 1872, xxviii., p. 345, t. 23. 
,, Flindersi, Etheridge fil.. Oat. Australian Foss., 1878, p. 11.6. 
Sp. Char. Shell discoidal, compressed, composed of four or five whorls rajiidly 
increasing and about one-fourth of the width of each exposed in an obtusely angular- 
edged, flat-sided umbilicus ; periphei'y narrow, sides nearly fl.it, ornamented with gently 
