42 GRIMES : MYINGYAN, MAGWE AND PAKOKKU DISTRICTS. 



Meiocardia, sp. nov. 

 Pecten, sp. nov. 

 Cardita (i new species). 

 Nucula (i new species). 

 Litlwdomus. 



Crassatella (i new species). 

 Cytherea lilacina, Lin. 

 Paracyathus coeruleus, Duncan. 



4. A very hard band, six inches to one foot in thickness, about 



goo feet above the base. This is a very persistent and conspicuous 



band and has been discovered in several places. It is characterised 



by a Mytilus. 



Myiilus nicobaricus, Reeve. 

 Modiola, 2 new species. 

 Meiocardia, spec. nov. 

 Cytherea lilacina, Lin. 

 Cytherea {Dione) (2 new species). 

 Tellina, (2 new species). 

 Metis, spec. nov. 

 Gari, spec. nov. 

 Pecten, spec. nov. 

 Vulsella, spec. nov. 

 Cardita cf. mutabilis, d'Arch. 

 Paracyathus coeruleus Duncan. 

 Lima, spec. nov. 

 Corbula rugosa, Low. 

 5. Another calcareous band higher still, containing Cardita 

 tjidaniarensis, Martin. A glance at the fossils brought back shows 

 that they are shallow- water marine forn s. A large proportion of 

 them are gastropoda, and the lamellibranchiata consist of forms like 

 Mytilus, Pecten, Cytherea, etc., which are found in the shallow 

 waters close to land. 



It will also be noticed that the fossiliferous bands are in the bottom 

 1,000 feet of the upper miocene beds, and in the higher beds fossils 

 are wanting or rare. This want of fossils may be due to the dying 

 out of the mollusca, owing to the water gradually becoming brackish 

 as pliocene times are approached, when fresh-water beds were 

 deposited on the top of these miocene beds, and some support is 

 ( 42 ) 



