268 THE PROCEEDINGS OF THE LINNEAX SOCIETY 



with two rather shallow radiate grooves and transversely striate, 

 striae at the marginal end becoming scaly raised imbricateous, 8 

 to 10 in number, interstices furnished with two to three con- 

 spicuous, slender, granular ribs, umbones very acute, ears with 8 

 to 10 very granular ribs. Long. 60, lat. 50. thickness of two 

 valves 30 millim. 



The scaly margin gives this shell somewhat the aspect of P. 

 pallium, but that has a generally depressed habit, and the scales 

 cover the test. It cannot be mistaken for P. asper of South 

 Australia, which has about 25 ribs, but the peculiar multiradiate 

 form of the ribs allies it to that shell and the common Australian 

 P. bifrons. It is something like P. radula, Linn, of the Philip- 

 pine Islands, but the shape is different altogether. It is an 

 Australian form, but with only remote resemblances, unless to 

 one still existing in the neighbouring seas. 



There are three other casts of univalves in the collection 

 which can be determined. One is a Phos, which appears to be 

 new, but is hardly sufficiently preserved for description. The 

 other is a Strombus, of the subgenus Monodactyles, probably also 

 new, though allied in form to S. Novce Zealandice. The third 

 can be identified with some certainty. It is 



Dolium costatum, Desh. in Lamarck, vol. X., p. 144. 

 There is no other species known to me which has the peculiar 

 subacute distant ribs and decidedly canaliculate suture, all of 

 which, as well as the corresponding shape are well shown in the 

 cast in Mr. Macleay's museum. It is a common form in the 

 Indian Archipelago, and I believe specimens have been found on 

 the coast of New Guinea also- 



These facts confirm the opinion I have already expressed, that 

 we have in these deposits a very recent tertiary formation, much 

 newer than any of the Murray River or Western Victorian beds. 

 There are no fossils of any kind common to the New Guinea 

 rocks, and those of Southern Australia and the general aspect of 

 both is totally different. 



