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 /. australis, McCoy, and /. tnarathonensis, 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 /. campylodon, 

 and says they " have a rough bony square base like those of /. 

 campylodon (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 /. campylodon. In my 

 paper on this fossil, I called attention to the necessity of affording 

 another name to /. australis, Hector, a New Zealand species 

 distinct from McCoy's. This has now been done by Mr. Lydekker 

 terming it /. hectori,\ 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." 



Ichihyosaurtis indictis, Lydk.,!^ seems to be an allied species to 

 /. australis, and also vied with /. campylodon 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., 18G7, p. 355. 



t Loc. cit., p. 113. 



X Loc. cit., p. 113. 



§ Pal. Indica (4), i., 3, 187H, p. 27. 



