362 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



CLADOCORA ARBUSCULA (Le Sueur). 



1820. CaryophylUa arbicscula Le Sueur, Paris Miis. M^m., vol. 6, p. 275, pi. 15, 



figs. 2a-2c?. 

 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, Pleisto3ene, 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 al3oiit 20 fathoms deep. 



Family ORBICELLIDAE Vaughan. 

 Genus ORBICELLA Dana. 



1846. OrbicellaBA^A, IT. 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 Verrill, Conn. Acad. Ai'ts and Sci. Trans., vol. 11, p. 93. 

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



Type-species. — -Midrepora annularis EUis and Solander. 



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

 ties are treated as valid in the present papei-s: 

 OrhiceUa annularis (EUis and Solander). 

 limhata (Duncan). 

 imperatoris, new species. 

 altissima (Duncan). 

 antiUarum (Duncan). 

 cavernosa (Linnaeus). 



var. endothecata (Duncan), 

 var. cylindrica (Duncan). 

 aperta (Verrill). 

 lainhridgensis, new species. 

 costata (Duncan). 

 canalis, new species. 

 tampdensis, new species. 



var. silecensis, new variety 

 hrevis (Duncan) = 

 insignis (Duncan). 

 intermedia (Duncan). 

 galhi, new species. 

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

 necessary to say that under the name Asiraea megalaxona^ Duncan 

 described from Antigua a silicified coral which is not determinable; 

 that his Astraea crassolameUata ^ and its varieties are here referred to 



' Geol. Soc. London Quart. Journ., vol. 19, p. 420, pi. 13, figs. 12a, 125, 1863. 

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



