362 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



CLADOCOKA ARBUSCULA (Le Sueur). 



1820. Carybphyllia arbuscula Le Sueur, Paris Mus. Mem., vol. 6, p. 275, pi. 15, 



figs. 2a-2rf. 

 1901. Cladocora arbuscula Vaughan, U. S. Fish. Commission Bull, for 1900, vol. 2, 

 p. 298, pi. 2, figs. 3, 3a (with synonymy). 

 This species is common in the Pleistocene marls near Colon. 

 Locality and geologic occurrence. — Canal Zone, station 5850 and 

 6039, Pleistocene, Mount Hope, collected by D. F. MacDonald. 

 Living: in Florida and the West Indies on reef flats and in water from 

 8 or 9 to about 20 fathoms deep. 



Family ORBICELLIDAE Vaughan. 



Genus OBBICELLA Dana. 



1846. Orbicella Dana, U. S. Expl. Exped. Zooph., p. 205. 



1849. Phyllocoenia Milne Edwards and Haime, Comptes Rend., vol. 27, p. 469. 



1901. Orbicella Vaughan, Geol. Reichs Mus. Leiden Samml., ser. 2, vol. 2, p. 21. 



1902. Orbicella Verrili,, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 93. 

 1918. Orbicella Vaughan, Carnegie Inst. Washington Pub. 213, p. 85. 



Type-species. — Midrepora annularis Ellis and Solander. 



Of this perplexing genus of corals, the following species and varie- 

 ties are treated as valid in the present papers : 

 Orbicella annularis (Ellis and Solander). 

 limbata (Duncan). 

 imperatoris, new species. 

 altissima (Duncan). 

 antillarum (Duncan). 

 cavernosa (Linnaeus). 



var. endothecata (Duncan), 

 var. cylindrica (Duncan). 

 aperta (Verrili). 

 bainbridgensis, new species. 

 cosiata (Duncan). 

 canalis, new species. 

 tampaensis, new species. 



var. silecensis, new variety 

 brevis (Duncan). 

 insignis (Duncan). 

 intermedia (Duncan). 

 gabbi, new species. 

 As synonymy is discussed on subsequent pages, it is here only 

 necessary to say that under the name Astraea megalaxona 1 Duncan 

 described from Antigua a silicified coral which is not determinable; 

 that his Astraea crassolam-ellata 3 and its varieties are here referred to 



GeoT. Soe. London Quart. Journ., vol. 19, p. 420, pi. 13, figs. 12a, 126, 1863. 

 ; Idem., p. 412, p!. 13, figs. 1-7. 



