GKULUGV AKO PaLEOInIOLOGV OF THE CANAL ZONE. 357 



1848. Stephanocoenia interscpta Milne Edwards and Haime, Ann. Sci. nat., 



ser. 3, Zool., vol. 10, p. 300, pi. 7, figs. 1, la, 16. 

 1848. Stephanocoenia michelinii Milne Edwards and Haime, Ann. Sci. nat., 



ser. 3, Zool., vol. 10, p. 301. 

 1864. Plesiastraea spongi/ormis Duncan, Geol. Soc. London Quart. Joiirn., vol. 20, 



p. 39, pi. 4, figs. 6a, 66. 

 1866. Stephanocoenia debilis Duchassaing and Michelotti, Sup. Mem. Corall. 



Antilles, p. 76, pi. 9, figs. 7, 8. 

 1884. Antillustraea spongi/ormis Duncan, Linn. Soc. London, Journ., Zool., 



vol. 18, p. 108. 

 1895. Stephanocoenia intersepta Gregory, Geol. Soc. London Quart. Journ., vol. 



^ 51, p. 276. 

 1900. StephanocoeniaiiiterseptaYAVOUAyi, U.S. Geol. Surv.Mon. 39, pp. 152,153. 



1900. Plesiastraea goodei Verrill, Conn. Acad. Arts and Sci. Trans., vol. 10, 



p. 553, pi. 67, fig. 1. 



1901. Stephanocoenia intersepta Vaughan, Geol. Reichs. Mus. Leiden Samml., 



ser. 2, vol. 2, p. 20. 



1902. Plesiastraea goodei Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, 



p. 106, fig. 1, p. 172, pi. 31 (not pi. 30 as given in the text), figs. 1, la. 



1915. Stephanocoenia intersepta Vaughan, Carnegie Inst. Wash. Yearbook No. 13, 



p. 222. 



1916. Stephanocoenia intersepta Vaughan, Carnegie Inst. Wash Yearbook No. 14, 



p. 221. 



Although the origmal description of Lamarck is brief, it is good. 

 According to him, "Cette espece forme de large plaques un peu 

 convexe, et offre a sa surface un reseau assez fin, constitue par les 

 bords reunis des cellules. On voit un petit axe au centre de chaque 

 etoile." He placed Madrepora intersepta Esper doubtfully in its 

 synonymy. Esper says regarding his specimens of the species: 

 "Es kommt diese Koralle von den ostindischen Meeren; ich habe sie 

 gleichfalls durch die Giite des Herrn Prediger Chemnitz, mitgetheilt 

 erhalten." It appears that Chemnitz had specimens from both the 

 Atlantic and the Indo-Pacific and that he gave numbers of them to 

 Esper. Apparently in some instances the locality labels were con- 

 fused, and that this is one of them, for Esper's figures (pi. 79, figs. 

 1-3) are fairly good for the West Indian and Floridian species to 

 which the specific name intersepta is now applied, and seem to me 

 to represent no other living species of coral with which I am famiUar. 



The corallum is massive, either subhemispherical or pulvinate in 

 form. The coralUtes are not protuberant, joined directly by their 

 walls or by costae, in the latter case exothecal dissepiments may be 

 present. The diameter of the caHces ranges between 2 and 3 mm. 

 Septa in three cycles. Primaries and secondaries bear well-developed 

 pali, by which they are joined to the columella. Tertiaries thin and 

 relatively short. Septal margins subentire or very finely dentate. 

 Columella, a compressed style of nearly the same height as the pali. 

 Endothecal dissepiments subhorizontal, thin, average about 0.5 nmi. 

 apart. 



