FoshU Cora/s. 221 



number of septa is about 14-16. Endotlieca scanty, with the 

 corallites traversed b)' a large axial cavity. 



Distribution. — Christmas Island. 



No. 919. Reef on top of the high cliff east of Phosphate 

 Hill ; alt. 600 feet. 



Figure. — PI. XIX, Fig. 6. Part of a transverse section, x 2 clia. 



Affinities. — This species is of interest as helping to connect 

 von Reuss's two genera Anisocosnia and Faroidea, which, it seems 

 to me, should be united, for they agree in all essential characters. 

 The new species resembles Favoidca jtmghulmi, Ilss.,^ the type 

 species of Favoidca, by having elongated corallites, which appear 

 to divide by fission. A transverse section closely resembles 

 von Eeuss's figure of the corallum of his species. In the 

 chai-acters of the septa, however, this new species most closely 

 resembles Anisocosnia ; for the septa arc thick and short, and 

 they are traversed by the central groove, clearly indicated in 

 von Reuss's figure (op. cit., pi. i, fig. 2b). The main difference 

 between this new species and those of von Reuss is, that in both 

 the latter internal sections show that the corallites are united by 

 an exothecal layer, whereas in the Christmas Island coral they 

 unite directly. This difference does not seem to me of much 

 importance in this case ; it may be explained as due to comparison 

 between slices at different depths in the corallum. 



Group FUXGIDA. 



Coscinaraea andrewsi, sp.n. 



Diagnosis. — Corallum apparently massive. Corallites large, 

 about 10 mm. in dia. (possibly in short series). Columella well 

 developed, about 2 mm. in dia. Septa thick, trabeculate throughout. 

 Three complete cycles, with representatives of the fourth ; the 

 septa of the third cycle are often unequal, and the sequence in 

 the sectors is often asymmetrical. 8ynapticulae rare. 



Distribution. — Christmas Island. Orbitoidal Limestone of the 

 central nucleus at Fhing Fish Cove. Xo. 836. 



Figures. — PI. XIX, Fig. 8. Part of a transverse section, x 2 cHa. 



Affinities. — The species is founded on a small fragment, which, 

 however, shows the characters of the corallites verj^ distinctly. 

 The genus is one of much interest, as it is one of the Fungids with 

 very trabeculate septa. The species differs from the type C. monile, 

 Forsk., by its larger corallites, which are less elongate and more 

 regular in fonn. The septal sequence is irregular and somewhat 

 indefinite. 



' Yon Keass : op. cit., p. 168, pi. i, fig. 4. 



