BY FREDERICK CHAPMAN. 267 



organisms has been well preserved in this limestone. The Fora- 

 minifera are as follows : — 



Miliolina cf. semhiuhim, Linn, sp, 



,, cf. ohlonga, Mont. sp. 



,, cf. subrotu7ida, Mont. sp. 



Textularia cf. grameii, d'Orb. 

 GlohigerUia hulloides, d'Orb.; common. 

 Truncatulina refuJgens, Montf. sp. 

 Cm'penteria sp. 



Miogypsina neodit^pansa, Jones & Chapm. sp. 

 Aniphistegiiia lessoni, d'Orb. 

 Heterostegina margm-itata^ Schlumb. 

 Lepidocyclina insulce-natalis, Jones tfe Chapm. 



,, ,, var. incEqualis, Jones & Chapm. 



,, (?) sicmatreusis, Brady. 



212. — " Tuff with calcareous fragments interbedded with the 

 sedimentaries dipping 55°. Wai Bubo, Santo." 



A tufaceous limestone. In hand specimens it is of a dark 

 blue-grey colour, showing on the fractured surfaces angular frag- 

 ments of a decomposed (greenish) andesitic rock. 



The microscopical examination of this rock shows it to be 

 largely made up of organic fragments such as are seen in a typical 

 consolidated coral-sand, but with the addition of chips of igneous 

 rocks and numerous felspar crystals. The cement appears to be 

 formed of a fine brownish volcanic ash. 



The calcareous particles consist of the coenenchyma of corals, 

 Lithothamnloyi, and spines of echinoids. The following Fora- 

 minifera were also met with : — 



Textularia sp. 



Glohigerina bulioides, d'Orb. 



Carpenteria sp. 



Amphistegina lessoni, d'Orb. 



Lepidocyclina insulce-iiatalis, Jones & Chapm. 

 5, cf. martini, Schlumb. 



