New and Ji<ire Fo-ssUfi. 31 



Fain. BAIRDIIDAE. 



Cxenu.s BAIKDIA, McCoy. 



Bairdia AMYfJDALOiDKS, G. S. Biady. (Plate VT., Fig. 6). 



Bairdia ami/(/daloi(/ex, G. S. Brady, 1865, Trans. Zool. 

 Soc, Lond., vol. v., p. 364, pi. Ivii., figs. Ga-c. Idem. 

 1880, Rep. Chall., Zool., vol. i., pt. iii., p. 54, pl. ix.. 

 figs. 5rt-/; pl. X., figs. 2a-c. Chapman, 1910, Proc. 

 Roy. Soc, Vict., vol. xxii (N.S.), pt. ii. p.. 307. 

 Observations. — 



The above species has been met with in fossil deposits only (mce 

 ■previously, namely, at Batesford, near Geelong, in beds of Janjuk- 

 ian age. In the Mallee bores the continuity of the fossil series 

 with the living form is seen in the fact that examples occur in both 

 Janjukian and Kalimnan. beds. The fossil specimens are slightly 

 smaller, but otherwise typical, with tlie exception that the dorsal 

 margin is rounder and the posterior acumination sulcated, as in 

 B. victrix,^ from which species it differs in its more elongate shape 

 .and less strongly arched dorsal margin. It probably points to an 

 ancestral type from which both living forms have diverged through 

 • differences in environment. 



In the living state B. amygdaloides has a fairly wide distribu- 

 tion, for it ranges from the coral islands of the Pacific and Torres 

 Strait to Port Jackson, and even as far south as Mqncoeur Id.. Bass 

 Strait. Its bathymetrical range is doAvn to 160 fathoms. 



Occurrence. — Bore 4, 180-190 feet (Janjukian). Bore 10. 310- 

 320 feet (Kalimnan or Janjukian). Bore 11, 542-544 feet (Jan- 

 jukian). 



Bairdia australis, .sp. nov. (Plate VI., Fig. 7) 



Bairdia ovata, G. S. Brady (non Bosquet sp.), 1865, Trans. 



Zool. Soc, Lond., vol. v., p. 354, pl. Ivii., figs. ~ia-c. 



Idem, (in R. Etheridge's Report). 1876, Geol. Mag. 



Dec. ii., vol. iii., p. 335. 



Bairdia (?) ovata, G. S. Brady (non Bosquet sp.), 1880, Rep. 



Chall. Zool., vol. i.. pt. iii., p. 53, pl. vii., figs. ?>a-d. 



Observations. — As Dr. Brady has already pointed out,''^ the 



recent specimens from Simon's Bay, South Africa (15-20 fathoms), 



and from the E. of New Zealand (150 fathoms), differ from 



1. G. S. Brady. Ibid, p. 56, pl. x., fi^s. ,5a-d. 



2. Tom. cit, 1S80, p. 54. 



