GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 359 



While in Turin in 1897 I examined the specimens identified by 

 Duchassaing and Michelotti as Stephanocoenia intersepta and S. miche- 

 lini. They belong to the same species. It is said of 8. debilis: "Bien 

 que les dimensions des calices de cette espece soient les memes que 

 dans la Stephanocoenia michelini, elle s'en distingue pourtant par la 

 muraille, par les cloisons plus minces, et par les palis qui atteignent 

 la hauteur de la columeile." The only character of apparent value is 

 the height of the pali, which are as tall as the columella. The pali 

 and columella are usually of nearly the same height in the species; 

 in areas on some specimens the columella is somewhat taller; in other 

 areas the pali are taller. 



I examined Duncan's type of Plesiastraea [later described as Antil- 

 lastraea] spongiformis and a specimen identified by him as Stephano- 

 coenia intersepta. The corallites of the former are united by their 

 costae, and where the costae meet there is often a second wall outside 

 the true corallite wall. The second specimen had been cut, the larger 

 piece bearing the label Stephanocoenia intersepta; the smaller piece, 

 which fits into the larger, was labeled Plesiastraea spongiformis. 

 Duncan, it seems, could not distinguish between the two. I agree 

 with Gregory in placing Plesiastraea spongiformis hi the synonym of 

 Stephanocoenia intersepta. 



Plesiastraea goodei Verrill, fragment of the type No. 36497, 

 U.S.N.M., is precisely the same as Stephanocoenia intersepta — there 

 are no differential characters. 



Distribution of Stephanocoenia intersepta. — Just how old, geolog- 

 ically, this species is, is not definitely known. 



Jamaica. — There is a specimen in the United States National 

 Museum bearing the station number 2580, which is for the collection 

 made by Messrs. J. B. Henderson and C. T. Simpson in the Bowden 

 marl of Jamaica. 



Santo Domingo. — Miss C. J. Maury obtained five specimens of this 

 much-named species, as follows : 



Rio Gurabo: Zone D, associated with Siylophora affinis Duncan, 

 Madracis decaciis (Lyman) , Pocillopora crassoramosa Duncan, Orbicella 

 limbata (Duncan), Orbicella cavernosa var. cylindrica (Duncan), Syzy- 

 gophyllia dentaia (Duncan); zone E, associated with Placocyathus 

 new species, Placocyathus variabilis Duncan, Siylophora new species, 

 Madracis decaciis (Lyman), Syzygophyllia dentaia (Duncan), Pavona 

 new species. Limestone, Los Quemados, associated with Placocy- 

 athus variabilis Duncan. As zones I and H of Miss Maury's sec- 

 tion represent the Bowden fauna, zones E and D are stratigraphi- 

 cally above the Bowden. 



Cuba. — I collected a specimen near the Morro, at the mouth of 

 Santiago Harbor, altitude about 240 feet above level. This specimen 

 may be of Pleistocene age. The general basement country rock is 

 37149— 19— Bull. 103 12 



