118 THE VICTORIAN NATURALIST. 



1888. Diplodonta subquadrata, Johnston. Geology of 

 Tasmania, p. 234, pi. 32, f. 14, 14A. 



1893. Diplodonta subquadrata, Tate and Dennant, 

 Trans. Roy. Soc. South Aust., vol. xvii., pt. i, 

 p. 225. 



1896. Diplodonta subquadrata, Pritchard. Proc. Roy. 



Soc. Vic, vol. viii., n.s., p. 133. 



1897. Diplodonta subquadrata, Harris. B. M. Cat. 



Aust. Tert. Moll., pp. 375, 376. 



Loc. — Lower beds of Muddy Creek, Western Victoria ; clay 

 beds of Mornington or Balcombe's Bay, and Grice's Creek ; 

 Shelford ; Barwon River beds below Inverleigh ; lower beds of 

 the Lower Moorabool Valley — Balcombian. Spring Creek beds, 

 near Geelong ; Table Cape beds, Tasmania — Jan-Jukian — 

 Eocene. 



Obs. — In the " Proceedings of the Zoological Society of 

 London" for 1855, on pages 230, 231, Carpenter describes a 

 Diplodonta subquadrata from the Californian and West Mexican 

 coasts, which is quite a distinct shell from ours. As this living 

 species has priority over our fossil, which was similarly named by 

 Professor Tate in 1887, it becomes necessary to bring forward a 

 new name for our fossil species. 



Trigonia acuticostata, M'Coy. 



1866. Trigonia acuticostata, M'Coy. Geo. Mag., vol. 

 iii., pp. 481, 482, f. I. 



1875. Trigonia acuticostata, M'Coy. Prod. Pal. Vict., 



Dec. ii., p. 21, pi. 19, f. I, 2. 



1876. Trigonia acuticostata, M'Coy. Ann. Mag. Nat. 



Hist, p. 273. 

 1886. Trigonia acuticostata, Tate. Trans. Roy. Soc. 



South Aust., vol. viii., p. 145. 

 1 90 1. Trigonia acuticostata. Hall. Proc. Roy. Soc. Vic, 



vol. xiv., n.s., pt. i., pp. 17, 21. 



Loc. — Sandy clays of Beaumaris, Port Phillip ; Jemmy's Point 

 beds, Gippsland Lakes ; upper beds of Muddy Creek and Grange 

 Burn, Western Victoria 3 oyster beds of the North-West Bend, 

 Murray River, South Australia ; from Tickera, near Wallaroo, and 

 from the upper beds at Aldinga, Professor Tate says casts pro- 

 bably of this species. 



Obs. — This is a well-characterized species and easy of identi- 

 fication, especially with M'Coy's excellent figures in the " Pro- 

 dromus," but, unfortunately, some little confusion has arisen 

 concerning it, as the outcome of M'Coy's own statement that he 

 had identified it as a living species in Bass Strait. Even so late 

 as 1902, when hunting through living Trigonias, Mr. Hedley's 

 endeavours to place this species only resulted in fixing it as a 



