82 Proceedings of the Royal Society of Victoria. 



Localities and Age. — Muddy Creek (upper and lower beds), 

 Spring Creek, Waurn Ponds and Batesford (Jan Jukian, 

 Balcombian and Kalimnan). Prof. Tate has recorded 

 Astrogonium^ from our Older Tertiary beds, and possibly my 

 specimens are similar to those he collected. 



Ophiupoidea. 



cf. SiGSBEiA. (PL XL, Figs. 6, 7.) 



A single vertebral ossicle is all I have found to show the 

 pi-esence of the order in our tertiaries. Its articular faces some- 

 what resemble those of Sigsbeia, as figured by Lyinan,^ but there 

 is a rather closer approach to the hour-glass shaped articulations 

 of the Cladophiurae than is shown by Sigsbeia, besides which, it 

 differs from the latter genus in being wider above than below. 

 The podial canals open on the distal face. Greatest width, 

 1.5 mm. The only specimen is somewhat corroded. 



Locality and Age. — Grange Burn ("Forsyth's"), near Hamilton. 

 Kalimnan (? Miocene). 



Holothupoidea. 



Chirodota, sp. (PI. XI., Fig. 8). 



The spicules of holothures are not as a rule reliable guides to 

 generic position, but wheels with six rays are in recent forms 

 confined to the genus Chirodota,^ so I have referred the fossil to 

 that genus. 



The wheel figured measures 0.27 n)m. in diameter, and was 

 obtained by Mr. C. M. Maplestone in some material supplied to 

 him by myself from the beds at Spring Creek. I believe that 

 this is the first record of fossil holothurians from Australia. The 

 genus is world wide in recent seas, and on this account we should 

 be justified in assuming its backward range in time. 



1 Jour. Roy. Soe. New South Wales, v. 22 (1889), p. 252. 



- Challenger Rep., v. 5, pi. 43, figs. 5, 6. 



3 Theel, H.: Report on the Holothuroidea dredged by H.M.S. Challenger, pt. ii.; 

 Challenger Reports, Zoology, vol. 14, p. ,33. Ludwig, Dr. H.: In Bronn's Klassen und 

 Ordnungen des Thierreichs, Bd. 2, Abth. 3, p. 39. 



