SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
From the Tentaculite slates (G*) of Bohemia, Barrande has 
described Lunulicardium granulosum, which, although a more 
depressed shell, is closely related to our species, more especially 
in the granulose ornament of the shell surface.* 
In the shaly mudstone from the mouth of Starvation Creek 
there also occur numerous small bivalves (Figs. 64, 65), which, 
on first examination, might reasonably be mistaken for a species 
of Vasta; in its superficial character and general form, however, 
it corresponds very closely to the prodissoconch and early disso- 
conch stages of Lunulicardium antistriatum. In connexion 
with these specimens it is interesting to compare the figure of 
? Vlasta, sp., figured by Mr. F. R. C. Reed from the Upper 
Silurian beds of Zebingyi, Burma.t 
Horizon and Locality—Silurian (Yeringian). Common in 
the blue slates and shales of McMahon’s Creek, Upper Yarra, 
Dept. of Mines coll. (8778); Reefton, near Warburton, Dept. of 
Mines coll. (3432, 3434).t 
The apparently young examples, or micromorphs of the pre- 
sent species occur at Mount Matlock, associated with Tentacu- 
lites matlockiensis, Chapm., specimens presented to the Museum 
by N. Lepoidivil, Esq., in 1877; and from the mouth of Starva- 
tion Creek, coll. Dept. Mines, Vict. (3368).§ [2257 (type), 2255, 
2260-61. | 
Family Ambonychiide. 
Genus Amponycuia, J. Hall, 1847. 
Ambonychia acuticostata, McCoy, P1. IV., Fig. 66. 
? Ambonychia acuticostata, McCoy, 1852, Brit. Pal. Foss., 
p. 264, Pl. 1K., Figs. 16, 16a. 
Observations.—This is a sub-trigonal or sub-ovate shell, 
which in its general form and ornamentation closely resembles 
McCoy’s species from the Wenlock and Lower Ludlow Beds of 
Wales. Our specimen shows a less distinct costation on the 
umbonal part of the shell, but this may be due to imperfect 
*Syst. Sil. Bohem., Vol. VI., Pt. I., Pl. 192, Figs. 6-10. 
+ Palwontologia Indica, N.S., Vol. II., Mem. 3, 1906, p. 119, Pl. VI., f. 37. 
$See Prog. Rep. No. IV., 1877, Geol. Surv. Vict., pp. 156, 157, where the late Sir F. 
McCoy indicated their age to be Upper Silurian (Ludlow). 
§See tom. supra cit., p. 156, where McCoy refers to these specimens as “‘a small 
Aviculoid shell allied to Ambonychia (new species).” 
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