DEPOSITS OF BLITONG. 19 



for example Bulla naucum, Cerithium asperum, Cer. ver- 

 tagus , Cer. procerum , which , as it is known , are only 

 little or not at all coloured, could never have been dis- 

 tinguished from recent individuals , if the locality , where 

 they were found , had remained unknown , because even 

 the polish of the shells is sometimes well preserved. 



With exception to Prionastraea tesserifera Ehrhg., which 

 has hitherto only been found in the Red sea, all ani- 

 mals mentioned in the following list belong to the fauna 

 of the Indian archipelago according to the statements in 

 the literature on the subject or to the specimens contai- 

 ned in the collections at Leyden and Amsterdam. Moreover 

 the corals of the Indian ocean are very little known, and 

 considering the fact , that a great number of them also oc- 

 cur in the Red sea, Prionastraea tesserifera Ehrhg. can- 

 not change our opinion: 



That the fauna of the stream-tin-deposits of 

 Blitong agrees ') with that of the sea surroun- 

 ding the island of Blitong in the present time, 

 that therefore these deposits must be regarded 

 as a posttertiary formation, which is aequiva- 

 lent, so far as can be judged by the facts hi- 

 therto observed, to strata from Mount Sela 

 of Java. 



LIST OF SPECIMENS. 



CRUSTACEA. 4. Strombus Isabella Lam. 



1. Balanus amaryllis Darw. 5. Strombus canarium Lin(?) 



MOLLuscA. 6. Pteroceras lambis Lam. 



a. Cephalopoda. 7. Terebellum subulatum 



2. Nautilus pompilius Lin. Lam. 



b. Gasteropoda. 8. Murex adustus Lam, 



3. Strombus urceus Lin. 9. Murex crassispina Lam. 



1) The"re is even a great conformity in the varieties, both of the spe- 

 cies from the Blitong-sea and the species from the Blitong stream-tin-de- 

 posits. 



!N'ot08 troxa the X^eyden Museum, Vol. IXI. 



