Victorian Fossils. 9 



incurved beneath the beaks and transversely rounded to meet the 

 nearly straight ventral margin. Posterior margin subangular, meet- 

 ing the hinge-line in a straight upward slope. Surface with concen- 

 tric grooves and finer striae between. 



Dimensions. — Height, 28 mm.; width, 28 mm.; thickness of the 

 two valves, 16.5 mm. 



Observations. — To some extent this species resembles the com- 

 moner and more widely distributed Diplodonta halcombensis,^^ but 

 the large umbones and the strong umbonal ridge, the squarer contour 

 and the greater convexity all separate it from the other species. 



I have much pleasure in naming this species after Mr. W. J. Harris, 

 B.A., who discovered the shell. 



Occurrence. — Bird Rock Cliffs, Torquay. 



Age. — Jan jukian ( Miocene ) . 



Class GASTEROPODA. 



Order ASPIDOBRANCHIA. 



Sub-order RHIPIDOGLOSSA. 



Fam. TURBINIDAE. 



Genus Astralium, Link. 

 Sub-genus Imperator, Montfort. 



Astralium (Imperator) hudsonianum, Johnston. (Plate II., Fig. 15.) 

 Imperator (Astralium) imperiale (?) Johnston, 1876. Proc. 



Roy. Soc, Tasmania, p. 90c. 

 Imperator hudsoniana, Johnston, 1888. Geol. Tasmania, pi. 



xxix., figs. 12, 12a. 

 {'i)Imperator tasmanica, Johnston, 1888. Ibid., p. 239. 

 Astralium {Imperator), johnstoni, Pritchard, 1896. Proc. 



Roy. Soc. Vict., vol. viii. (N.S.), pp. 116-118. 

 Astralium (I.) hudsoniayium, Johnston, sp., Chapman, 1912. 

 Proc. Roy. Soc, Vict. vol. xxv. (N.S.), pt. i., p. 188 

 and footnote 2. 

 Observations. — The figure given by Johnston in his Geology of 

 Tasmania, although unaccompanied by any description, renders this 

 form a valid species. In re-naming this form as Astralium (Imperator) 

 johnstoni, Dr. Pritchard gives a very full description, and adds fur- 

 ther Victorian localities. 



The specimen before us, which we have taken the opportunity 

 to figure, i& from Rose Hill, Bairnsdale. It is a large and fairly well- 

 preserved shell, having a maximum diameter of 72 mm., with a height 

 of 35 mm. The characters agree almost exactly with those men- 

 tioned by Pritchard. The spiral threads are often coarse and broken 



15. Diplodonta subquadrata, Tate. Trans. R. Soc, S. Australia, vol. 

 ix., 1887, p. 147, pi. xiv., figs. 10a, b. D. balcombensis (nom. mut), Pritchard. 

 Victorian Naturalist, 1906, vol. xxiii., p, 117. 



