SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
Affinities . — Our species appears to be closely allied to 
Whidborne’s Actinopteria hirundetta *, from the Devonian of 
Lummaton, Devonshire. The latter species differs in the more 
forward position of the beaks, and in the straight posterior 
slope behind the umbones. Anotner species having the same 
type of shell is “ Pterinea ” ventricosa, Goldfuss.f 
Horizon and Locality . — -Silurian (Melbournian). East of 
Heathcote; coll. Geol. Surv. Viet. [7938.] 
Genus Leiopteria, J. Hall, 1883. 
Leiopteria cf. oweni, J. Hall. Plate V., Figs. 74, 74a. 
Leiopteria oweni, J. Hall, 1884, Pal. New York, Vol. V., 
Pt. 1, Lamell. I., p. 170, PI. XX, Fig. 10. 
Observations . — The Victorian specimen is represented as a 
fairly complete cast in mudstone. So far as can be seen, it 
resembles the above species in its outline, and details of surface 
markings, such as the undulose growth lines and faint and com- 
paratively widely-spaced radii. Hall’s specimens came from 
the Hamilton Group of New York State. 
Mr. P. Etheridge, jun, has described a species probably 
referable to this genus under the name of Leiopteria f 
australis\, from the Carboniferous, near West Maitland, New 
South Wales. Our species could scarcely be compared with the 
former, which has a shorter hinge-line, and consequently smaller 
posterior wing, whilst in outline it differs considerably, being- 
altogether a higher shell. There are, moreover, no traces of 
radii in Etheridge’s species. 
Horizon and Locality . — Silurian (Yeringian). Kilsyth, 
Croydon; presented by Mr. Thos. Warr. [7939.] 
Family Peetinidae. 
Genus Aviculopecten, McCoy, 1852. 
Aviculopecten spryi, sp. nov. PI. V, Fig. 75. 
Description . — Shell small, sub-orbicular; ventral border 
almost circular; narrow at cardinal area, hinge-line short, ears 
well defined. Umbo fairly conspicuous. Surface broken by 20 
grooves, the intermediate areas forming depressed convex ribs 
with a strong median striation and fainter lateral striae. 
* Pal Soc. Mon, Vol. XLVI., 1892, Devonian Fauna of the S. of England, p. (j:, 
PI. VI, Figs. 5, 6; PI. VII, Fig. 4. 
t Petrefactia: Germanise, Vol. II, 1837, p. 134, PI. CXIX, Fig. 2. 
+ Records Geol. Surv. N.S.W, Vol. V, Pt. IV, 1898, p. 178, PI. XIX, Fig. 19. 
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