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 raihoad, collected by T. W. Vaughan. As these specimens 

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

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

 another to the considerable list of living species recognized in the 

 La Cruz marl. 



POBITES FUKCATA Lamarck. 



181G. Pontes furcata Lamarck, Hist. nat. Anim. sans Vert., vol. 2, p. 271. 

 1887. Pontes furcata Rathbun, U. S. Nat. Mus. Proc, vol. 10, p. 3G1, pL 15, figs. 

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



1901. Pontes ■pontes iormafurcata Vaughan, U. S. Fish Com. Bull, for 1900, vol. 



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



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



11, p. 158. 

 1913. Porites /areata Vaughan, Carnegie Inst. Washington Yearbook No. 10, p. 

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



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



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



1916. Porites furcata Vaughan, Carnegie Inst. Washington Y^earbook No. 14, p. 

 228. 



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

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

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

 MacDonald. 



Costa Rica, Mom Hill, Niveau a, H.- Pittier collection. 



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

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

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

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

 It has not been found in Bermudas.^ 



PORITES BARACOAENSIS, new species. 



Plate 147, figs. 1, la. 



Corall'um 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 waU and fused by their bases, forming a mural sheK on the inner 

 margin of which the granule^ stand up as compressed knots or as 



1 See Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 158, 1902. 



