495 
elevated undulating or sigmoidal ribs or folds bending towards the aperture, and about 
half an inch apart on the middle of the whorl. These and the interspaces are occupied 
by delicately arranged equidistant parallel lines or cost®, which pass over the back; 
aperture oval, back rounded and narrow, no keel ; inner whorls exposed ; walls of 
umbilical cavityangnlar, flat-sided, or bevelled and smooth ; seven much-divided lobes in 
the septa of each side, two of which are within the edge of the umbilicus. {McCoy and 
HtJieridge.') 
Ohs. This Ammonite, in its intermittent folds, involution of whorls, and general 
habit, much resembles A. Bcudan.ti, D’Orb., from the Gault of England and France, to 
which it is certainly closely allied. This is the opinion of Mr. R. Etheridge, F.R.S.; and 
Sir F. McCoy’s appears to have been the same, for he says : “ So nearly identical with 
the very common A. BeudanH (Br.) of the French Lower Chalk, that, but for being 
slightly less compressed, and a slight difference iti some of the septal lobes, it could 
scarcely be separated, even as a variety.” 
I have examined the type in the National Museum, Melbourne, and believe Mr. 
Etheridge’s var. Mitchelli to be a synonym of Sir F. McCoy’s species. 
A very small and neat, smooth and discoidal Ammonite (PI. 30, figs. 5 and 6), 
with nearly flat sides, has been found in the mud-stone of Aramac AFell. The shell is 
flat, of three to four whorls, umbilicus small, the back semi-rounded, with a very delicate 
keel, and a thin test. With the exception of the keel this appears very like what the 
young of A. FUndcrsi would be. It is of the same character and proportions, but is even 
more like that of A. Gardeni, Baily,* which has similar whorls and keel. The latter is 
common to the Cretaceous of both South Africa and India. 
The back of the little Ammonite is too broad for A. olene, Woods, and there are 
no transverse rugae, although they are, to some extent, of the same type. 
Loc. Base of Walker’s Table Mountain, Flinders River {Messrs. Sutherland 
and Carson — National Museum, Melbourne) ; Hughenden Station, Flinders River {The 
late a. Baintree ; G. Colin. Sweet, Melbourne); [? Barcaldinc Railway Station, 
Central Railway {B. Sexton) ; ? Aramac VV ell, at two hundred aud ninety feet 
{S. Sharivood)'], 
Ammomtes Daintreei, 'Etheridge., PL 29, figs. 1-3. 
•Ammonites Daintreei, Etheridge, Quart. Journ. Geol. Soc., 1872, xxviii., p. 346, t. 24. 
Sp. Char. Shell discoidal ; whorls depressed or flattened at the sides, with a 
rather narrow rounded back. The sides of the shell ornamented with numerous nearly 
equal aud closely arranged ribs, all of which are slightly arcuated, and pass over the 
hack or dorsal edge; umbilicus wide and deep, allowing half the inner whorls to be 
exposed; sides of the whorls around the umbilicus steep-sided, rounded, or subaugular ; 
'•'Perture broadly oval, the outer whorl embracing two-thirds of the next inner whorl. 
The ribs at the terminal portion of the last or body-chamber are somewhat unequal and 
coarser. 
Ohs. I have searched every available source for information relative to this 
®hell, and cannot recognise any species approaching it in the Cretaceous rocks of 
Europe, India, or America. It has someatlinify with A. asterianus, D’Orb., but wants 
the tubercle around the umbilicus; and the ribs are greatly bent or slightly sigmoidal, 
'*'’heroas in A. asterianus they arc straight. It also resembles, in the ribs, some forms 
or varieties of A. Herveyi, but is not so tumid a shell. It occurs associated with 
A. Beudanti, D’Orb., Ancyluccras and Inocerand.,\\\ the Hughenden Beds. {Eiheridgei) 
Loc. Hughenden {The late B. Baintree ; G. Sweet — Colin. Sweet, Alelbourne). 
» Quart. Journ. Geol. Soc. 1855, xi., t. 11, f. 3a and 6. 
