80. Two New Interesting Tertiary Hydrozoa from the Philippine Islands

Abstract

Very recently Mr. Wataru HASIMOTO, a graduate of our Institute, collected two interesting fossils of the hydractinoid Hydrozoa from Marinduque, Philippine Islands. One of them is from a dark grey limestone of Cabuyo Barrio, Trijos, Marinduque. Though fragmental, it exhibits very characteristic features reminding us strongly of the genus Circopora, which W. WAAGEN and J. WENTZEL established in 1887 on Circopora faveolata W. & W., from the Middle Productus limestone of the Salt Range, India; for a while it is referred to the same genus with query. The other is derived from a conglomerate bed exposed along the Hinalogan river, Boac, Marinduque. In its superficial aspect it is more or less similar to Ellipsactinia STEINMANN, 1878, with the genotype Ellipsactinia ellipsoidea STEINMANN from the Tithonian of Stramberg, Moravia, but the two diverge in some essential details and cannot be generically identical, as will be explained below, and a new genus Philippinactinia is proposed for the Philippine Hydrozoa.
At this place we wish to express our sincere thanks to Mr. HASIMOTO for his kind offer of these fossils to our study.