SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
and along the cardinal area, boldly arched in the middle, and 
thence sloping gently to the back and basal margin. A few 
faint irregular concentric striae or growth-lines present. 
Indications of the anterior buttress just below the umbo; this 
feature is shown more clearly in another specimen collected from 
the same locality by Mr. F. P. Spry. 
Measurements. — Height, 7.5 min.; length, 14 mm.; depth of 
valve, about 3 mm. 
Affinities . — -The nearest form to the above appears to be 
Nuculites oblongatus, Conrad , * a fossil of the Hamilton Group 
of N. America, and already compared with our N. maccoyianus. 
The above species differs, however, from the N. American 
example in being slightly more convex at the umbones, more 
strongly curved on the ventral margin, and more attenuated 
posteriorly. It differs from the previously-described N. mac- 
coyianus in the more forward position of the beaks and the 
acuter posterior extremity. 
Horizon and Locality . — Silurian ( ? Yeringian), Wan- 
dong,f Victoria. Presented by Mr. J. T. Jutson. Also from 
the^same locality, presented by Mr. F. P. Spry. [7893 (type), 
Family Nueulidse. 
Genus Nucula, Lamarck, 1799. 
Nucula melbournensis, sp. nov. PI. II., Figs 99 30 31 31a 
0)32, (?)32fl, (?)33, (?)33a. ’ ■ ’ ’ ’ 
Description. Shell broadly ovate, ventral margins evenly 
convex; cardinal line oblique, arcuate; anterior end short 
obliquely rounded towards the base; posterior end broad an cl 
rounded. Beaks prominent, pointing slightly forward and 
closely adpressed. Greatest thickness of valves just below the 
beaks. Surface sculptured by varices or undulse at more or less 
equal intervals. Adductor impressions well-marked on the 
surface of casts. 
Measurements.— Type specimen.— Length, 13 5 mm . 
height, 10.5 mm.; width of shell near umbones, 6 mm. 
*J- Hall, Pal. N. York, Vol. V., Pt. I., 1885, LameTl. II., p. 
3 2 4 > m XL VII., Figs. 
t The rock containing the above fossils is a dark brown irregularly bedrlerl 1 * 
probably younger than the dark impure limestone with Dalmamfes fournl I t (‘ j 
of the same locality. lound to th e westward 
1 28 ] 
