﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 499 



Miocene, Santiago, Cuba, m 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. jiorites, I am referring them to that species. This adds 

 another to the considerable list of living species recognized m the 

 La Cruz marl. 



PORITES FIJKCATA Lamarck. 



1816. Poritesfxircata Lamarck, Hist. nat. Anim. sans Vert., vol. 2, p. 27L 

 1887. Pontes fur cata Kathbun, U. S. Nat. Mus. Proc, vol. 10, p. 361, pi. 15, ligs. 

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



1901. Pontes pontes iorm&furcata Vaughax, U. S. Fish Com. Bull, for 1900, vol. 



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



1902. Pontes polyviorpha Verrill (part), Conn. Arad. Arts and Sci. Trans., vol. 



11, p. 158. 

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

 156, pi. 5, figs. 5c, Qc, 7, 8; pi. 6, figs, la, 1*, 2a, 2b. 



1915. Pontes 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. Vi''ashington Yearbook No. 14, p. 

 228. 



. * 



Localities and geologic occurremce. — 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, Moin Hill, Niveau a, H. Pittier collection. 



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

 material behind elevated, sea-fron.t 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.^ 



PORITES BARACOAENSIS, new species. 



Plate 147, figs. 1, la. 



CoraUum 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 Urpper 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 coiTesponding 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 shelf on the inner 

 margin of which the granules stand up as compressed laiots Or as 



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



