GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 499 



Miocene, Santiago, Cuba, in the La Cruz marl, at station 3441, east 

 of La Cruz, near crossing of the road from Santiago to the Morro 

 over the railroad, collected by T. W. Vaughan. As these specimens 

 agree in all details that I can discover, with the thicker-branched 

 forms of P. pontes, I am referring them to that species. This adds 

 another to the considerable list of living species recognized in the 

 La Cruz marl. 



PORITES FURCATA Lamarck. 



1816. Pontes fur cata Lamarck, Hist. nat. Anim. sans Vert., vol. 2, p. 271. 

 1887. Parties furcata Rathbun, U. S. Nat. Mus. Proc, vol. 10, p. 361, pi. 15, figs. 

 1-3; pi. 17, fig. 1. 



1901. Pontes pontes forma furcata Vaughan, U. S. Fish Com. Bull, for 1900, vol. 



2, p. 316, pi. 30; pi. 31, fig. 1. 



1902. Pontes polymorpha Verrill (part), Conn. Acad. Arts and Sci. Trans., vol. 



11, p. 158. 

 1913. Pontes furcata Vaughan, Carnegie Inst. Washington Yearbook No. 10, p. 

 156, pi. 5, figs. 5c, 6c, 7, 8; pi. 6, figs, la, 16, 2a, 26. 



1915. Pontes furcata Vaughan, Washington Acad. Sci. Journ., vol. 5, p. 597. 



1916. Pontes furcata Vaughan, Nat. Acad. Sci. Proc, vol. 2, p. 95. 



1916. Pontes furcata Vaughan, Carnegie Inst. Washington Yearbook No. 14, p. 

 228. 



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

 tions 5850 and 6039, Mount Hope, and 6554, dug out of mud flat, 

 about 1 foot above ordinary high-tide level, Colon, collected by D. F. 

 MacDonald. 



Costa Rica, Moin Hill, Niveau a, H. Pittier collection. 



Pontes furcata is a common Pleistocene species. It is usual in the 

 material behind elevated, sea-front reefs of the West Indies and east- 

 ern Central America, and it is one of the most abundant corals on 

 the flats inside the living coral reefs in the same region and Florida. 

 It has not been found in Bermudas. 1 



PORITES BARACOAENSIS, new species. 



Plate 147, figs. 1, la. 



Corallum composed of slender branches. The type, a fragment of 

 a branch, is 26 mm. long; lower end, subcircular in cross section, 6.25 

 mm. in diameter; 8.5 below upper end, the diameter is 6 by 8 mm., 

 showing some flattening just below a bifurcation. 



Calices polygonal, excavated but rather shallow; diameter from 

 1.25 to 2.25 mm., about 1.75 mm. usual. Wall straight, acute or with 

 rather coarse knots corresponding to the outer ends of the septa; a 

 distinct mural shelf is present in all or nearly all calices. 



Septa arranged into a solitary directive, four lateral pairs, and 

 a ventral triplet. There is a circle of septal granules detached from 

 the wall and fused by their bases, forming a mural shelf on the inner 

 margin of which the granules stand up as compressed knots or as 



1 See Verrill, Cone Acad. Arts and Sci. Trans., vol. 11, p. 15S, 1902. 



