On a Precaudal Vertehra of Ichthyosaurus australis. 143 



27. Ixias marianne. 



Papilio marianne, Cramer, Pap. Exot. iii. pi. ccxvii. C-E (1782). 



Ixias bebryce, Hiibner, Verz. bak. Schmett. p. 95 (1816). 



Ixias aqniverna, Moore, Ann. & Mag. Nat. Hist. ser. 4, vol. xx. p. 50 



(1877). 

 Ixias depaljyura, Butler, P. Z. S. 1883, p. 153, pi. xxiv. figs. 6, 7. 

 Ixias meridionaUs, Swinhoe, P. Z. S. 1885, p. 140, pi. ix. tig. 5. 

 Ixias cumballa, Swinhoe, t. c. p. 141, pi. ix. figs. 13, 14. 



We have twenty-five examples of the wet-season form 

 (/. cumballa)^ thirteen of the intermediate form (/. marianne) ^ 

 twenty-three of the early dry form (/. meridionaUs), and 

 sixteen of the late dry form (/. agmverna = depal2mra) — 

 seventy-seven examples in all. 



28. Ixias nola. 

 Ixias nola, Swinlioe, P. Z. S. 1889, p. 399. 



Mahableshwar. Twelve examples. B. M. 



The seasonal forms are all represented in our series ; a pair 

 of the wet and a pair of the dry form are equally labelled as 

 types. 



XXIII. — On a Precaudal Vertebra of Ichthyosaurus australis, 

 McCoy. By R. Etheridge, Jun., Curator *. . 



The subject of this paper is the imperfect vertebra of a large 

 Ichthyopterigian, referable, I believe, to IcJithyosaur us australis, 

 McCoy t* 'I'he original was brought under my notice by the 

 Rev. M. Kirkpatrick, of Bega, N. S. Wales, who obtained it 

 from Marathon, Central Queensland. With his permission a 

 cast was taken for the Australian Museum collection. As 

 Sir F. McCoy's description was very brief, an extended notice 

 of one of the middle trunk, or anterior precaudal, vertebrse 

 may be acceptable to Australian investigators. 



The specimen is the centrum of a large vertebra measuring 

 5 inches in its vertical and transverse diameters, and rivals in 

 size those of the gigantic /. campylodon. Carter, from the 

 European Chalk, the vertebra figured \ by the late Sir Richard 

 Owen measuring only 4 inches high. Our example is devoid 

 of the neural spine, neurapophyses, and pleurapophyses, but 



* From the ' Eecords of the Australian Museum,' vol. iii. no. 3 

 pp. 66-68. 



t Trans. Roy. Soc. Vict. viii. 1868, p. 41. 

 X Owen, Men. Foss. Reptilia Cret, Formation, p. 79, pi. xxii. 



11* 



