68 
RECORDS OF THE AUSTRALIAN MUSEUM. 
an animal twenty-five feet long. Similar vertebrae to that now 
described he states possessed a diameter of four inches, and else- 
where he remarks* * * § that the longitudinal measurement reached 
one and a half inches. The elastic capsule was also preserved in 
some of his specimens. 
Mr. R. Lydekker, in the previously mentioned “ Catalogue,” 
gives a list of species that “ cannot be classified.”! Amongst 
these are 1. australis , McCoy, and /. marathonensis , mihi. I am 
afraid he has overlooked Sir Frederick’s principal paper on his 
/. australis , wherein, although the description is meagre, the latter 
specially compares the teeth of his fossil to those of I. campy lodon, 
and says they “ have a rough bony square base like those of I. 
carnpylodon (Carter) ” As regards /. marathonensis , mihi, less 
can perhaps be definitely said, but the whole of its structure, so 
far as we know it, is also after the type of T. carnpylodon. In my 
paper on this fossil, I called attention to the necessity of affording 
another name to I. australis , Hector, a New Zealand species 
distinct from McCoy’s. This has now been done by Mr. Lydekker 
terming it 1 . hector J but unfortunately the species is of no value, 
from the absence of either description or figure, all that Sir James 
Hector says about it being “ this genus is only represented in the 
collection by a single vertebral centrum.” 
Ichthyosaurus indicus , Lydk.,j$ seems to be an allied species to 
I. australis , and also vied with 1. carnpylodon in size. It is from 
the Ootatoor Group, the homotaxial equivalent of the Chalk Marl 
and Upper Greensand of England. 
McCoy’s original specimens were from Walker’s Table Mountain 
on the Flinders River. The present vertebra is, as before said, 
from Marathon on the same stream. Both are localities in the 
Rolling Downs Formation, or Lower Cretaceous. 
* Ann. Mag. Nat. Hist., (3), xix., 1867, p. 355. 
f Loc. cit ., p. 113. 
J Loc. cit., p. 113. 
§ Pal. Indica (4), i., 3, 1879, p. 27. 
