SILURIAN BIYALVED MOLLUSCA OF VICTORIA. 
Palceoneilo producta, sp. nov. PI. III., Pigs. 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 curving boldly do the cardinal line. 
Beaks acuminate and salient, nearly central. Valves depressed- 
convex below; highest in the middle and at the umbonai region, 
sloping steeply towards the front, and gently to the posterior 
extremity, except, where interrupted by the umbonai ridge and 
sulcus; the latter is rather feebly developed, and is parallel with, 
and in front of, the posterior umbonai ridge. Shell surface 
marked with very fine, regularly concentric striae, about 12 to 
the millimetre, counted on the middle of the shell below the 
umbonai 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 
Palceoneilo 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 striae aie 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. L. P. Spry). Also 
from the Domain-road sewer, S. Yarra. In the coll Geoh Surv 
Viet, a single specimen from N. of Yan Yean B b - 11 r7Q91 
(type), 7922, 1563.] ’ ' L 
Palceoneilo ? constricta, Conrad sp. PI. in., Fio- 54 
Nuculites constricta. Conrad. 1842 Journ Arnrl ATa + 
Sci., Philad., Vol. VIII., p. 249, PI. XV., Fig. 8.' 
Palceoneilo constricta, Conrad sp., J. Hall 1885 p Q i ivt 
York, Vol. V., Pt. I., Lamell. II., p 1 333, PI. XLVIII FUs 
1-16; PL LI., Fig. 17. 
pi 
* Palaeont. N. York, Vol. V., Pt. I., 1885, Lamell II p ^ Pi ^ 
. XCIII., Fig. 11 a. ’ P ' 34S ’ U - * 
XLVIII., Fig. 39 ; 
