GEOLOGICAL FORMATIONS. 57 



Schizaster, sp. 

 Maretia cf. planulata. 

 Meoma, sp. 

 Breynia carinata. 

 JSchinolampas jacquemonti. 



PacJiyseris murcJiisoni. 

 Hydnophora plana and other species 



ECHINODEEMATA. 



Mcliinolampas spheroidalis. 

 JEchinodiscus, sp. 

 Clypeaster profundus. 

 C depressus. 

 Ccelopleurus forbesi. 



Anthozoa. 



Cladocora haimei. 

 Mycedium costatum. 



FoEAMINIFEBA. 



Operculina canalifera. j Orhitoides papyracea. 



The commonest and most characteristic fossils of this group are Ostrea 



multicostata 1 and Breynia carinata. There cannot 

 Character of fauna. 



be any question that the Gaj fauna is newer 



than eocene; some of the species are recent (for instance, Dosinia 



pseudoargus is identical with the recent D. exasperata, Chemn.), and it is 



probable that many others, when they are compared with recent forms 



more carefully than has hitherto been done, will prove to be the same as 



living species. Several genera, too, as Maretia, Breynia, Meoma, EcJiino- 



discus, Cladocora, and Mycedium, are unknown in the older tertiaries, 



and there is almost a complete disappearance of eocene forms, very few 



species being common to the Nari beds even. The chief doubt is 



whether the Gaj should not be considered as upper miocene. 



The only mammal yet obtained from the Gaj beds is Rhinoceros 

 sivalensis — a species found also in the Siwaliks. 



7. Manchhar group. — The highest sub-division of the Sind tertiary 

 Representatives of series has been named from the large lake, a few 

 Siwaliks. mileg west of Sehwan. The group doubtless 



represents generally the far better known Siwaliks of Northern India, 

 and it is probable that the upper and lower limits of the two may be the 

 same, but the fossiliferous bands are at different horizons. 



1 It is not quite certain whether this species is identical with the European Eocene form, 

 but it is certainly the shell figured by Messrs. D'Archiac and Haime. A species known by 

 the same name is found in Rhaetic beds in Europe. 



( 57 ) 



