ON SOME FOSSILS FROM THE ISLANDS OF FORMOSA & RIU-KIÜ. 9 



Zoœcia : Urceolate ; contiguous ; walls thin ; aperture not more 

 than one half the diameter of the cell ; orbicular, with 

 a sinus in front. 

 Avicularia : Numerous ; irregularly distributed over the 

 zoarium, arising sometimes in front and sometimes at 

 the sides of the apertures. 

 Cellepora formosensis is undoubtedly allied to the Cellepora 

 pumicosa Linn, of our present seas ; to the G. tubiger a of the 

 English Crag, which is by some authors looked upon as identical 

 with C. pumicosa; and to C. mammillata Busk. Generally, C 

 formosensis differs from these in the relatively larger dimensions 

 of the zoœcia and the more delicate walls, and in the arrange- 

 ment of the avicularia. 



Occurrence : The figured specimen was obtained by Mr. 

 Yoshiwara from the limestones of Sha-kö-kö near Roku-ryo, 

 North of Kee-lung harbour, North Formosa. We found the 

 same species in the limestones from Rei-suiko, 10 miles S.W. of 

 Tai-hoku, the chief town of Formosa ; also in the limestones from 

 Shin-ko-gai, 10 miles due S. of Tai-hoku. We have now found 

 it in the Orbitoidal limestone from Sonai, Iriomoté* Island, Rifi- 

 Kiü (=Loo Choo Islands of European maps). All these lime- 

 stones appear to be of Miocene age. 



Cellepora sp. (PI. Ill, fig. 7.) 



Our slides contain a few specimens of another species of 

 Cellepora with smaller cells but we have not had sufficient 

 material to enable us to work out the species. 



One of the specimens is shown in fig. 7 of Plate III, 

 associated with Orbiloidcs {Lepidocyclina) angularis. 



