GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 361 



examined. As I am able to recognize the species I am treating it 

 as valid. Duncan records the form from the "Nivaje shale and 

 tiifaceous limestone of vSanto Domingo." 



Locality and geologic occurrence. — Costa Rica, ' ' Colline, en demoli- 

 tion," Limon, No. 618 of H. Pittier collection, associated with 

 Asterosmilia liilli, Stej^hanocoenia intersepta, and Balanoj)liyllia pittieri. 

 A single, small, immatm'e specimen. The illustrations present its 

 characters well enough to make a detailed description unnecessary. 



Santo Domingo, Rio Gurabo, zone F, of Miss C. J. Maury's sec- 

 tion, associated with Placocyathus . variabilis Duncan and AntiUia 

 dnhia (Duncan). 



Genus EUSMILIA Milne Edwards and Haime. 



1848. Eusmilin Milne Edwards and Eaime, Comptes Rend., vol. 27, p. 467. 

 Type-species. — Madrepora fastigiata Pallas. 



EUSMILIA FASTIGIATA (Pallas). 



1766. Madrepora fastigiata Pallas, Elencli. Zooph., p. 301. 



1895. Eusmilia fastigiata Gregory, Geol. Soc. London Quart. Journ., vol. 51, 



p. 260 (with synonymy). 

 1895. Eusmilia knorri Gregory, Geol. Soc. London Quart. Journ., vol. 51, p. 261 



(with synonymy). 



1901. Eusmilia knorri Yavgkan, Geol. Reichs. Mus. Leiden Samml., ser. 2, vol. 



2, p. 13. 



1902. Eusmilia aspera Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 114, 



fig. 3. 



1915. Eusmilia fastigiata Vaughan, Washington Acad. Sci. Journ., vol. 5, p. 596. 



1916. Eusmilia fastigiata YAHGH.AN, Carnegie Inst. Washington Yearbook No. 14, 



p. 227. 



Study of large suites of Eusmilia convince me that Eusmilia 

 fastigiata (Pallas) and E. aspera (Dana) = E. Tcnorri M. Edwards and 

 Haime are not specially separable, as there is great variation and 

 complete overlapping in the columeUar characters by which they 

 were distinguished. 



Localities and geologic occurrence. — Canal Zone, Pleistocene at sta- 

 tions 5849, Mount Hope; Costa Rica, 6251, Monkey Point, collected 

 by D. F. MaoDonald. 



General in the living and Pleistocene coral reefs of Florida, the 

 West Indies, and the Caribbean coast of Central America. 



Family ASTRANGHD^ Verrill. 



Genus CLADOCORA Ehrenberg. 



1834. Cladocora Ehrenberg, Corallenth. Roth. Meer., p. 85 (of separate). 

 1848. Cladocora Milne Edwards and Haime, Comptea Rend., vol. 27, p. 493. 



Type-species. — CaryopTiyllia cespitosa Lamarck. 



