THE 
GHOLOGICAL MAGAZINE 
NEW SERIES. DECADE VI. VOL. III. 
No. XII.—DECEMBER, 1916. 
ORIGINAL ARTICLES - 
—_—_@—_ 
T.—Eocenrt Corats From THE Fry River, Centra New Gorvea. 
By J. W. GREGORY and JEAN B. TRENCH, University of Glasgow. © 
(PLATES XXI-XXII.) 
(Concluded from the November Number, p. 488.) 
Actinacts, D’Orbigny, 1849. 
Actinacis maitlandi,’ n.sp. (Pl. XXI, Figs. 2, 3.) 
Diagnosis.—Corallum massive and probably nodular. Corallites 
polygonal, often pentagonal, and, where the walls are not well 
defined, appear circular. Calices from 2 to 3mm. in diameter; the 
width of coenenchyma separating them varies from ‘5 to2mm. Septa 
twenty-four in number, subequal; the trabecule are distinct in some 
and in others fused together. Pali rounded; they occur in three 
crowns, the primary pali being larger than the others. They are 
sometimes quite separate from the septa, and sometimes completely 
fused with the septal ends. Together with the columella they occupy 
a space equal to one-third of the diameter of the calyx. Columella 
fairly large, though somewhat irregularly developed. Occasionally 
it is so small as to appear papilliform, but it is generally clearly 
fascicular. 
Dimensions.—Diameter of corallites, 2-6-3mm.; distance of calicinal 
centres, 3-5 mm. 
Figures.—P\. XX1, Fig. 2a, thin transverse section; x 6 diam. Fig. 20, 
polished surface of same; x 6. Fig. 3, thin transverse section of another 
specimen; X 6 dia. 
Affinities. —This species is represented in the collection by three 
specimens (Nos. 20, 26, 37). It resembles the type species A. 
martiniana, Orb. (1849, p-11), in the number and arrangement of 
septa, but the calices are nearly twice as large and the coonenchyma 
is much more sparse. It approaches more nearly to the A. remesz, 
Felix (1903, pp. 567-7), but the calices are greater than those of 
the latter and the ccenenchyma is also considerably less. Trauth 
(1911, p. 79) has described a new species, A. retifera, which has 
round or sub-polygonal calices, some of which equal A. maitlandi in 
size. The ccenenchyma, however, differs both in amount and 
character, and the columella is rudimentary. ‘These species are all 
Cretaceous. Of the Kainozoic species, A. noetlingi, Dalton (1908, 
p. 622, pl. liv, fig. 1), from the Miocene of Burmah, resembles. our 
1 After Mr. A. Gibb Maitland, one of the geological pioneers in British New 
Guinea. 
DECADE VI.—VOL. II.—NO. XI. 34 
