SILURIAN BIVALVED MOLLUSCA OF VICTORIA. 
australis, nov., and ! Parallelodon kilmoriensis, sp. noy. The 
Cucullella, sp., noted on + sheet 3 N.E., by McCoy, I have 
now referred to Nuculites coarctatus, Phillips sp. 
The following genera of bivalved shells have been recorded 
from the Silurian (“ Upper Silurian”) of Victoria by McCoy, 
in Progress Report, Geol. Surv. of Victoria, No. 1, 1874, p. 34. 
Cucullella, 2 spp. | = Nuculites). 
Area, sp. ae = Nucula and ? Parallelodon). 
Avicula, 2 2 spp. [| = Actinopteria). 
The fossil (No. 3368, Mines Dept.) alluded to by McCoy, in 
Progress Report No. IV., 1877, p. 156, as “a small Aviculoid 
shell allied to Ambonychia (new species)”, is here described and 
figured as probably a young form of a new speci Lunuli- 
cardium antistriatum. 
Three species of Silurian pelecypoda, which had already 
been described by the Rev. A. W. Cresswell, M.A.,* have been 
presented by him to our collection. These are Conocardium 
bellulum and C. costatum, originally described under the generic 
name Pleurorhynchus ; and Pterinea tatei, previously described 
as an Ambonychia, but probably identical with P. lineata, 
Goldfuss. 
The larger part of the remainder of these Silurian bivalved 
shells has been obtained from the richly fossiliferous mudstones 
at South Yarra over the area of the Yarra Improvement Works. 
They were chiefly collected by Mr. F. P. Spry (now of the 
National Museum). Other gentlemen who have kindly assisted 
us in obtaining new material are Messrs. J. T. Jutson, and A. E. 
Kitson, F.G.S., whilst the opportune donation from Mr. Thos. 
Warr, of material from a well-boring at Croydon,{ has resulted 
in the addition of several new and remarkable forms of aviculoid 
and other shells. In addition to the species previously men- 
tioned, we are also indebted to the Rev. A. W. Cresswell, M.A., 
for a valuable collection of mudstone fossils from near Lily- 
dale,t which has furnished us with several additional forms to 
our list of species. 
Some GENERAL ASPECTS OF THE SILURIAN BIVALVED FAUNA. 
The collection now described comprises 62 species and 
varieties, referred to 29 genera. Of the total number, as many 
as 58 species and varieties are here recorded from the Victorian 
*Proc. Roy. Soc. ace can v. e M S., mane pp- aan as 
+ For a preliminary description of this collection see Victorian Naturalist. Vol. 
XXITI., 1906, pp. 237-239- 
* See Mr. Cresswell’s remarks on the fossils and the precise localities in Proc. Roy.— 
Soc., Vict., Vol. VI., N.S., 1894, p. 156. 
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