GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 365 



1864. Orbicella annularis Verrill, Mus. Comp. Zool. Bull., vol. 1, No. 3, p. 48. 



1865. Orbicella annularis Verrill, Boston Soc. Nat. Hist. Proc, vol. 10, p. 323. 



1866. Heliastraea annularis Duchassaing and Michelotti, Sup. Mem. Coral! . 



Antilles, p. 84 (of reprint). 

 1866. Heliastraea lamarcki Duchassaing and Michelotti, Sup. Mem. Corall. 



Antilles, p. 84 (of reprint). 

 1866. Heliastraea acropora Duchassaing and Michelotti, Sup. M6m. Corall. 



Antilles, p. 84 (of reprint). 

 1866. Heliastraea barbadensis Duchassaing and Michelotti, Sup. Mem. Corall. 



Antilles, p. 85 (of reprint). 

 1866. Cyphastraea costata Duchassaing and Michelotti, Sup. M6m. Corall. 



Antilles, p. 85 (of reprint). 

 1868. Heliastraea barbadensis Duncan, Geol. Soc. Lond. Quart. Journ., vol. 24, 



p. 24. 

 1868. Cyphastraea costata Duncan, Geol. Soc. Lond. Quart. Journ., vol. 24, p. 24. 

 1895. Orbicella acropora Gregory, Geol. Soc. Lond. Quart. Journ., vol. 51, p. 272. 

 1895. Cyphastraea costata Gregory, Geol. Soc. Lond. Quart. Journ., vol. 51, p. 274. 

 1895. Echinoporafranski Gregory, Geol. Soc. Lond. Quart. Journ., vol. 51, p. 274, 



pi. 11, figs. 2a, 2b. 

 1901. Orbicella acropora Vaughan, Geolog. Reichs. Mus. Leiden Sarnml., ser. 2, 



vol. 2, p. 22. 



1901. Orbicella acropora Vaughan, U. S. Fish Commission Bull, for 1900, vol. 



2, p. 301, pis. 6, 8. 



1902. Orbicella annularis Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, 



p. 94, pi. 15, fig. 1. 

 1902. Orbicella annularis var. stellulata Verrill, Conn. Acad. Arts and Sci. 



Trans., vol. 11, p. 96, pi. 15, fig. 2. 

 1902. Orbicella hispidula Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 



100, pi. 15, figs. 3, 3a, 36. 



1902. Orbicella annularis Vaughan, Biol. Soc. Washington Proc, vol. 15, p. 56. 



1903. Orbicella annularis Duerden, Nat. Acad. Sci. Mem., vol. 8, p. 564, pis. 



8-10, figs. 64-73. 



1915. Orbicella annularis Vaughan, Washington Acad. Sci. Journ., vol. 5, p. 596. 



1916. Orbicella annularis Vaughan, Carnegie Inst. Washington Yearbook No. 14, 



p. 227. 



Subsequent study has led me to believe that changes should be 

 made in the synonymy as given in the first of my papers cited in the 

 synonymy. Phyllocoenia limbata Duncan, P. limbata var. tegula 

 Duncan, and Plesiastraea ramea Duncan represent one species and it 

 is separable from Orbicella annularis. As Phyllocoenia limbata is the 

 older name, the species should be designated Orbicella limbata (Dun- 

 can). The most conspicuous difference between it and O. annularis 

 consists in its primary septa being markedly more developed than 

 the secondaries. 



Orbicella annularis is the principal coral of the outer reefs in Florida , 

 the West Indies, and on the Caribbean side of Central America. It 

 is general in the elevated Pleistocene of the same region. 



Prof. J. Graham Kerr, of the University of Glasgow, has kindly 

 sent me photographs of the type of this species, which is preserved 



