18 POSTTERTIARY FAUNA FROM 



the posttertiary epoch as well. Still when similar faunas, 

 as the one here described from Blitong , will gradually be- 

 come known from a number of other islands, they can 

 yield interesting results with respect to the distribution oi 

 animals at a former period. For this reason I resolved to 

 pubhsh the following list in this journal. 



I succeeded in identifying sixty specimens of the sixty- 

 eight contained in the collection of Mr. de Groot with 

 still Hving forms. A single specimen, Cerithimn montis 

 Selae Mart., has hitherto only been observed in strata from 

 Mount Sela of Java (accompanied by Cypraea arabica Lin., 

 also occuring in Blitong) , in strata , to which I have as- 

 signed the name of ,, recente Meeresbildungen" (Comp. Die 

 Tertiarschichten auf Java. Allg. Theil pag. 34). As to the 

 remaining seven specimens , which belong to the genera 

 Balanus , Vermetus , Pinna , Chama , Lucina , Tellina , Tra- 

 chyphyllia, the five first represent forms, of which the 

 exact determination can hardly be successful , when only 

 undertaken by the aid of the literature on the sub- 

 ject, and as I have not been able to compare them with 

 recent representatives of allied forms, it is very possible, 

 that they do belong to recent species. As to Tellina 

 and Trachyphyllia I hold them to belong to new spe- 

 cies ^). At all events those seven organisms left unde- 

 termined are of no consequence in defining the age of 

 the stream-tin-deposits from Blitong as ,, posttertiary", 

 because moreover not one of all the species in question 

 has been observed in the tertiary strata of the Indian ar- 

 chipelago. 



This result is further supported by the extraordinary 

 good state of preservation of most of the remains. There 

 is a great number of shells with traces of colour and some 

 of them are only distinguished from the recent represen- 

 tatives by a somewhat fainter coloration. Other specimens, 



1) I cannot make it out with certainty, because the zoological literature 

 at hand in Leyden is deficient in many respects. 



^Notes froin the Leyden WLuseum, "Vol. HI. 



