42, Cretaceous Fossils in Australia. 
M‘Coy to establish the existence in Australia of the cre- 
taceous formation. The present collection enabled Pro- 
fessor M‘Coy on this occasion not only to confirm his 
previous determination of the geological age of the rocks of 
the district, but to make the very important announcement 
of the occurrence of Lnaliosawriun fossil reptiles of the 
genera Ichihyosawrus and Plesiosawrus, as well as the 
characteristic molluscous genus Ancyloceras and a Belem- 
mite, and a second species Ammonites allied to European 
cretaceous forms. These were exhibited and described under 
the following names :— 
I chthyosawrus Australis (M‘Coy). 
Numerous deeply bi-concave vertebree, the bodies 4, inches 
wide, 3 inches deep, and 14 inches long. 
Plesiosawrus Sutherlands (M‘Coy). 
Length of centrum 21 inches, width 3? inches, depth 24 
inches. This differs in its proportions from the New | 
Zealand Plesiosaurus, described by Professor Owen, to 
which it is most nearly allied. 
Plesiosaurus macrospondylus (M‘Coy). 
Having the bodies of the vertebree much longer in propor- 
tion to their width than any known species. Length 
3 inches, width 3 inches, depth 24 inches. The anterior 
and posterior margins are longitudinally wrinkled as in the 
P. rugosus. 
Ancyloceras Flindersi (M‘Coy). 
A gigantic species equalling the A. gigas of the Lower 
Greensand in size, but more nearly resembling the A. 
Tabarella of the French Lower Greensand in marking. 
Ammonites Sutherlandi (M‘Coy). 
A new small species like the French Am. — audiert of 
the Gault. 
Belemnitella diptycha (M‘Coy). 
A species with two dorsal inflected folds or sulci on the © 
dorsal face; broadly hastate guard, eight lines wide ; agreeing 
in size and shape almost exactly with the English and 
French lower cretaceous B. plena. 
