HILL : GEOLOGY OF THE ISTHMUS OF PANAMA. 275 



I have run over the specimens from Costa Rica. A good many of 

 them contain no fossils. Nos. 88 and 89 (Bonilla) so far as they are 

 fossiliferous have the Monkey Hill (Upper Oligocene) fauna, and while 

 the matrix is coarser the greensand material marked as occurring 

 ahove them is the same as the Monkey Hill matrix essentially, but 

 contain only unidentifiable fragments of fossils. No. 91, the Guallava 

 sandstone, is interesting. It is Lower Oligocene, and exactly comparable 

 or rather equivalent to our Vicksburgian, containing only Vicksburg 

 species, including the genuine Orbitoides mantelli, Phos, Dentalium, 

 Plicatula anomia, etc., all Vicksburg species. 



Report by Prop. R. M. Bagg upon the Foraminiferal Deposits 



NEAR BUJIO, AND OF THE EMPIRE LIMESTONE. 



The main mass of the rocks of the specimens forwarded is composed 

 of Orbitoides forbesii Carpenter, which is undoubtedly au Eocene form. 

 Other species identified are : Cristellaria lenticula Reuss ; Bulimina 

 ovata d'Orbigny ; Gaudryina reussi Stache ; Sagrina striata Schnager ; 

 Truncatulina sp. indet. 



All of the above are Tertiary forms. I have no hesitation in pro- 

 nouncing the rocks to be of Eocene age. 



Regarding the sections of the Empire limestone, it is not easy to 

 determine anything but generic types in sections. These slides you 

 send contain transverse sections of Nummulites, one Orbitoides, Cristel- 

 laria or Rotative type, and Nodosaria. It is probably an Eocene rock, 

 as the Nummulites are the predominating type. 



Report on the Fossil Corals Collected. 

 By T. Wayland Vaughan. 



Those from the old reef, 1^ miles west of Port Limon, Costa Rica, 

 are: Meandrina filograna (Esper.) ; Dichocoenia stokesi M. Edwards and 

 Haime; Orbicella acropora (Linn.); Siderastreea sp. ; cf. S. galaxea 

 (Pallas). 



All of these species are recent as well as fossil. 



Notes regarding the distribution elsewhere of these fossil species from 

 the raised reef near Port Limon, can be found in a memoir by Dr. J. W. 

 Gregory. 1 



1 Quart. Journ. Geol. Soc. London, Vol. LT. pp. 257-285, August, 1895. [See 

 also Verrill's Reports, cited on p. 172. — R. T. H.] 



