SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
Nucula cf. lirata, Conrad sp. PI. III., Fig. 44. 
Nuculites lirata, Conrad, 1842, Journ. Acad. Nat. Sci., 
Philad., Vol. VIII., p. 250, PI. 15, Fig. 7. 
Nucula lirata, Conrad, sp., J. Hall, 1885, Pal. N. York, Vol. 
V., Pt. I., Lamell. II., p. 316, PI. XLV., Figs. 5, 11, 15, 17-22, 
24, 25; PI. XCIIL, Fig. 5. 
Observations. — Our figured specimen is a crushed valve of 
a Nucula, showing the ligament-pit and denticulate cardinal 
area. The strong lirse and the general form of the shell, point 
to an affinity with the above species, which occurs in the 
Hamilton Group of N. America. 
Horizon and Locality. — Silurian (Melbournian). From the 
coll, of Geol. Surv. of Viet., Yan Yean, Bb. 14. (7914.] 
Nucula lamellata, 4. Hall. PI. III., Figs. 45 (var.), 46. 
Nucula lamellata, J. Hall, 1885, Pal. N. York, Vol. V., Pt. 
I., Lamell. II., p. 320, PI. XLV., Fig. 13; PI. LI., Figs. 18-21 ; 
PI. XCIIL, Fig. 7. 
Observations. — This species of Nucula is of a somewhat 
different type to the usual forms, particularly in the sub- 
quadrate outline, and the sub-central position of the beaks. A 
connecting link between the sub-ovate forms and this species is 
exemplified in N. lirata, Conrad, sp.* 
In nearly all the Victorian specimens before us, represented 
either as internal impressions or hollow casts, the ligament pit 
is visible. One of our fossils (Fig. 45) appears to be a short 
variety of the above species. The specimens referred to by 
McCoy on quarter sheet 4 S.W., Geol. Surv. Viet, (notes on Bb. 
18, 20, and 22), under the MS. name of Orthonotus subrigidus 
are here included under Nucula lamellata, J. Hall. 
In N. America, N. lamellata is found in the Hamilton and 
Chemung Groups in the State of New York. 
Horizon and Locality. — Silurian (Melbournian). Schist 
Hill, Merri Creek, coll. Geol. Surv. Viet., B b - 6; south end of 
Reservoir, Yan Yean, coll. Geol. Surv. Viet., B b 14; Broad- 
hurst’s Creek, east of Kilmore, coll. Geol. Surv. Viet., B b - 18 
(short variety); Kilmore creek, north of Special Survey, coll. 
Geol. Surv. Viet., B b - 20; Police Paddock, Kilmore, coll. Geol. 
Surv. Viet., B b - 22. Silurian (Yeringian); about H miles 
below Simmons’ Bridge Hut, on the Yarra, coll Geof Surv 
Viet., B16. [2252, 2243-49.] 
* See above references. 
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