SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
? Pterinea tenuistriata, McCoy. PI. IV., Fig 61. 
Pterinea tenuistriata, McCoy, 1852, Brit. Pal. Foss., p. 263, 
Pl, Yo Wie. 
Observations—The Victorian example shows very little 
difference from McCoy’s figured specimen; the chief distinction 
being the acute form of the ears, a character which is not suffi- 
ciently important to justify its separation from the British 
species. Were there other specimens for comparison it is prob- 
able that we should find more typical examples amongst them. 
The general form and surface ornament is similar to the British 
species. It has been recorded in Britain from the Wenlock and 
the Lower and Upper Ludlows. This species is doubt- 
fully referred to the genus Pterinea, as further examples may 
show that both McCoy’s and our specimens are really referable 
to Actinopteria. 
Horizon and Locality—Silurian (Melbournian). Yarra 
Improvement Works, 8. Yarra. Presented by Mr. F. P. Spry. 
[7928-29. ] 
Genus ActInopESMA, Sandberger, 1850. 
Actinodesma cf. ampliata, Phillips, sp. Plate VI., Fig. 87. 
Avicula ampliata, Phillips, 1848, Mem. Geol. Surv. Gt. 
Brit., Vol. 2, Pt. 1, p. 367, Pl. XXIII., Fig. 1. 
Pterinea ampliata, Phillips, sp., de Koninck, 1876, Foss. 
Pal. Nouv.-Galles du Sud, Pt. 1, p. 37. 
Observations.—A somewhat imperfect valve of a Pterinea- 
like shell which occurs in the present series is, with very little 
doubt, referable to the above genus. It is most closely allied to 
Phillips’ species above-mentioned, both in form and ornament, 
which fossil was originally described from the Upper Ludlow of 
Llangadoc in Wales. 
De Koninck has recorded this species from Silurian rocks 
at Dangelong, Cooma District, New South Wales. 
Comparison may also be made with J. Hall’s “ Glypto- 
desma” erectum,* from the Hamilton Group of N. America. 
This shell, however, is longer on the ventral margin, and the 
valve is not so strongly convex. 
* Pal. N. York, Vol. V., Pt. I., 1884, Lamell., I., p. 153, Pl. XI., Figs. 1-10; Pl. XII, 
Figs. 1-3, 5-9; Pl. XIII., Figs. 1-4, 12-15; Pl. XXV., Figs. 14-17; Pl. LXXXVL, Figs. 
1-8; Pl. LXXXVII., Figs. 1-3. 
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