A MONOGRAPH OF THE SILURIAN BIVALVED 
MOLLUSCA OF VICTORIA, EN THE COLLECTION 
OF THE NATIONAL MUSEUM, MELBOURNE. 
By Frederick Chapman, Palwontologist to the National 
Museum, Melbourne; Assoc. Linn. Soc. Lond.; F.RALS. 
INTRODUCTION. 
SOURCES OF THE PRESENT COLLECTION. 
A large proportion of the fossil specimens described herein 
was collected during the first Geological Survey of Victoria, 
under the direction of Mr. (afterwards Sir) A. R. C. Selwyn; 
and was deposited in the National Museum, Melbourne, then 
under the directorship of Professor (afterwards Sir) Frederick 
McCoy, who was at the time also paleeontologist to the Survey. 
Very few of the specimens were identified by McCoy :—a 
single species described in his Prodromus of the Paleontology 
of Victoria* under the name of Cardium gippslandicum 
[ = Panenka gippslandica), and some fossils generically deter- 
mined for future labelling as Orthonotus, Anodontopsis, Lepto- 
domus, Arca, Aviculopecten and Avicula, appear in the Museum 
collections. 
On the } sheet No. 1 N.W. Melbourne, McCoy noted the fol- 
lowing bivalved genera from Moonee Ponds Creek (“Royal 
Park”), viz., Sanguinolites ( = Orthonota australis sp. nov.) and 
Cucullella (= Nuculites maccoyianus, sp. nov.). 
The fossil referred to under the MS. name of Orthonotus 
subrigidus by McCoy on } sheet No. 4 S.W. Geol. Surv. Vict. is 
now shown, by the hinge structure, to be identical with Nucula 
lamellata, J. Hall, and not allied, as McCoy supposed, to 
Orthonota riqida Sow. sp. of the Upper Llandovery and Lower 
Ludlow of Great Britain. On the same geological map a 
Leptodomus allied to amygdalinus is noted by McCoy. This is 
now shown to be a distinct species, here named Leptodomus 
maccoyianus. Certain fossils named in MS. by McCoy as 
Arca spp. are herein described as Nucula opima, J. Hall, var. 
* Decade VI. ‘1879, p. 23; Pl. LVI. 
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