SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
Paleoneilo producta, sp.nov. Pl. IIL, Figs. 53, 53a. 
Description.—Shell small, ovate, very long, length more 
than twice the height; posteriorly attenuate, almost rostrate. 
Cardinal line only slightly arched, ventral border gently 
rounded, and curving upward toward the posterior end, then 
abruptly forward, meeting the cardinal line at an obtuse angle; 
well-rounded anteriorly, and cur ving boldly to the cardinal line. 
Beaks acuminate and salient, nearly central. Valves depressed- 
convex below; highest in the middle and at the umbonal region, 
sloping steeply towards the front, and gently to the posterior 
extremity, except where interrupted by the umbonal ridge and 
sulcus; the latter is rather feebly developed, and is parallel with, 
and in front of, the posterior umbonal ridge. Shell surface 
marked with very fine, regularly concentric striz, about 12 to 
the millimetre, counted on the middle of the shell below the 
umbonal inflation. 
Measurements.—Type specimen: Length, 15 mm.; height, 
6.75 mm.; depth of valve, about 2.5 mm. 
The average length of the larger number of specimens found 
is 11 mm. 
Affinities This species shows a certain relationship to 
Paleoneilo elongata, J. Hall,* from the Chemung Group (Upper 
Devonian) of the States of New York and Pennsylvania. ‘the 
points of difference, however, are these :— 
The present species has more acuminate beaks. 
It is proportionately more elongate. 
The cardinal margin is less arcuate. 
The surface striz are finer and more than twice as 
numerous. 
Horizon and Locality—Silurian (Melbournian). Common 
in the blue and brown shale at the Yarra Improvement Works, 
S. Yarra (type specimen presented by Mr. F. P. Spry). Also 
from the Domain-road sewer, 8. Yarra. In the coll. Geol. Surv. 
Vict. a single specimen from N. of Yan Yean, B> 11. [7921 
(type), 792 2, 1563. | 
Paleoneilo ? constricta, Conrad sp. Pl. III1., Fig. 54 
Nuculites constricta. Conrad. 1842. Journ. Acad. Nat. 
Sci, Philad., Vol. VIII. p. 249, Pl. XV., Fig. 8: 
Palaoneilo constricta, Conrad sp., J. Hall, 1885, Pal. N. 
Yorks Vol. V7 Pt. L.,;Lamell. TE) p.. 333, Pl) XEVIIL, Figs. 
L 16; 9P 1. Wels ‘Fig. te 
* Palxont. N. York, Vol. V., Pt. I., 1885, Lamell. II., p. 345, Pl. XLVIII., Fig. 39; 
Pls XCUUE.) Bigs mx. 
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