SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
Observations. — This species is named after Mr. Norman 
Taylor, who was attached to the Geological Survey of Victoria, 
and surveyed the district whence the present specimens came. 
Horizon and Locality. — Silurian (Melbournian). Broad- 
hurst’s Creek, east of Kilmore; coll. Geol. Surv., Viet., B b 18; 
also Yarra Impt. Extension, Hoyt’s l’addock, S. Yarra. Pre- 
sented by Mr. E. P. Spry. [7907 (type), 7908.] 
Nucula o^ima, J. Hall, sp., var., australis , nov. PI. TIT., Figs. 
39, 43. 
Cucullcea opima, J. Hall, 1885, Rep. 4th Geol. Distr. N.Y., 
p. 197, No. 78, Fig. 3 (p. 196). 
Nucula randalli, J. Hall, 1885, Palseont. N. York, Vol. V., 
Pt. I., Lamell. II., p. 315. PI. XLV., Figs G, 10, 16, 23, 26, 27; 
PI. XCIII., Figs. 1, 3. 
Observations. — In the general shape of the valves and their 
surface ornamentation our Victorian variety agrees fairly 
closely with the form figured by J. Hall under the names of 
Cucullcea opima and Nucula randalli. Hall remarked on the 
identity of the fossils described under the two above-named 
species, # but preferred to retain the later name since it had 
“ gone into the literature of the science.” The earlier name, 
however, should undoubtedly be employed, in accordance with 
accepted rules of nomenclature. The N. American examples 
were obtained from the Hamilton Group of the State of New 
York. 
The Victorian specimens are much smaller than the N. 
American, the largest measuring only 13 mm., whilst the average 
length of J. Hall’s examples is about 23 mm. In the Vic- 
torian variety there is a greater tendency for the concentric 
strirn to become fasciculate. Two of our specimens (PI. III., 
Figs. 41, 43) show a remarkable gibbosity of the umbonal area. 
Horizon and Locality.— Silurian (Melbournian). From the 
Yarra Improvement works, S. Yarra, presented by Mr. F. P. 
Spry; also from the coll. Geol. Survey of Victoria, north of Yan 
Yean, B b - 11; from a shaft of the tunnel in Reservoir, Yan 
Yean, B b 13; Fraser’s, or No. 3, Creek, Springfield, B b 25. 
Silurian (Yeringian). About H miles below Simmons’ Bridge 
Hut, on the Yarra; coll. Geol. Surv., Viet., B16. [7909 (type), 
7910-13, 965-6.] 
Op. supra, cit., 1885, p. 315, footnote. 
[ 31 ] 
