A MONOGRAPH OF THE SILURIAN B1YALVED 
MOLLUSUA OF VICTORIA, IN THE COLLECTION 
OF THE NATIONAL MUSEUM, MELBOURNE. 
By Frederick Chapman, Palaeontologist to the National 
Museum, Melbourne ; Assoc. Linn. Soc. Lond.; F.R.M.S. 
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 palaeontologist to the Survey. 
Very few of the specimens were identified by McCoy : — a 
single species described in his Prodromus of the Palaeontology 
of Victoria* under the name of Card'ium gi ppslandi cu rn 
[ = Panenl'a gippslandica ], and some fossils generically deter- 
mined for future labelling as Orthonotvs, A nodont apsis, T^epto- 
domus, Area, Aviculopecten and A mcul a, 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. Gcol. Surv. Viet, is 
now shown, by the hinge structure, to be identical with Nucul.a 
lamellata, J. ITall, and not allied, as McCoy supposed, to 
Orthonota, rigida Sow. sp. of the Upper Llandovery and Lower 
Ludlow of Great Britain. On the same geological map a 
Leptodom/us allied to amygdalimis 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 
Area spp. are herein described as Nuculd opium, J. Hall, var. 
* Decade VI,, 1879, p. 23, PI. I/VI 
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