482 J. W. Gregory & Jean B. Trench— 
The bulk of the corals and the foraminiferal rocks appear to have 
come from the same limestone, which is of Eocene and probably of 
Middle Eocene age. The cherts are probably Upper Cretaceous. The 
map in Mr. Gibb Maitland’s valuable but often overlooked memoir 
(1893, Map No. 3) colours the whole of the country along the Fly 
River, even to the north of 6°, as ‘‘ recent superficial deposits’’, for 
the rock exposures on the river bed would be too small to be shown 
on that map. 
Coral limestones have been repeatedly recorded from the interior of 
British New Guinea, but the references to them in the literature 
convey the impression that they have been regarded as young raised 
reefs, and therefore evidence of a great uplift in recent times. Mr. Gibb 
Maitland records the coral limestones on the Aird River in latitude ° 
7° 10’ S. as ‘‘raised coral reefs’’; and the same view has been 
adopted (e.g. Gibb Maitland, 1898, p. 63) for limestones as much 
as 2,000 feet above sea-level. The Eocene age of Sir William 
Macgregor’s corals suggests that the higher coral limestones may be 
.older than has been supposed. Dr. Logan Jack (1894, pp. 93, 94) 
has identified a fossil collected by Sir William Macgregor from the 
Purari River as a Cretaceous Belemnite. ‘The genus Actenacis, which 
is represented in the collection by two species, is more frequent in the 
Cretaceous than the Eocene; the specimens of A. maitlandi are 
identical in lithological character with the brown Kocene corals and 
are doubtless Hocene. The other Actinacis we identify as A. swma- 
traensis (Tornq.); it is in a white chert and is probably Cretaceous. 
The list of species is as follows :— 
Feddema sp. Kobya hemicribriformis, n.sp. 
Circophyllia sp. Actinacis maitlandi, n.sp. 
Stylina macgregori, n.sp. A. sumatraensis (Tornq.). 
Stylophora papuensis, n.sp. Porites deshayesana, Mich., var. 
Leptoria carnei, n.sp. mequisepta, n.var. 
Plesiastrea horizontalis, n.sp. Porites sp. 
Dachiardia macgregori, u.sp. Montipora antiqua, n.sp. 
Systematic Dxrscriprion. 
The collection includes three simple corals which are shown by the 
abundant dissepiments to be Astreans; but as only transverse sections 
are available the material is inadequate for specific description. 
Frppenia, Duncan, 1880. 
Two specimens (Nos. 17 and 21) have flattened sides, paliform 
lobes to the two first orders of septa, and have no columella; they 
agree with Feddenia from the Ranikot group, Lower Eocene, Sind. 
The diameter of the corallitesis 10 X 15mm. In No. 17 the number 
of septa is forty. Both specimens occur in a yellow foraminiferal 
limestone. 
Circopuyitiia, Ed. & H., 1848. 
This coral (No. 25) has an elongated cross section with parallel 
sidesand rounded corners. The wallsarethin. The columellais large 
and trabecular. There are no pali. The coral is therefore clearly 
a Circophyllia, which is atypically Eocene genus. A smallincomplete 
