﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 



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ACROPORA PALMATA (Lamarck). 



1816. Madrepora palmata Lamarck, Hist. nat. Anim. sans Vtrt., vol. 2, p. 279. 

 1893. Madrepora muricoia forma palmata Brook, Brit. Mus. (Xat. Hist.) Cat. 

 Madrep. corals, gen. Madrepora, p. 25. 



1900. Madrepora palmata Gregory, Ann. and Mag. Nat. Hist., ser. 7, vol. 6, 



p. 29. 



1901. Jsopora viurlcata forma palmata Vaxjgiian, U. S. Fish Com. Bull, for 1900, 



vol. 2, p. 313, pis. 26 and 27. 



1902. Acropora vmricata var. palmata Verriix, Conn. Acad. Arts and Sci. Trans., 



vol. 11, p. 166. 



1915. Acropora palmata Vaughan, Washington Acad. Sci. Journ., vol. 5, pp. 597, 



598. 



1916. Acropora palmata Vaughan, Nat. Acad. Sci. Proc, vol. 2, pp. 95, 100. 

 1916. Acropora palmata Vaughan, Carnegie Inst. Wasliington Yearbook No. 14, 



pp. 227, 228, 229, 230. 



Localities and geologic occurrence. — Costa Rica, Pleistocene at 

 station 6251, Monkey Point, collected by D. F. MacDonald. Also 

 in the slightly elevated reefs around Colon Bay. 



Acropora palmata is of general occurrence in the elevated Pleisto- 

 cene coral reefs of eastern Central America and the West Indies; 

 and is present on the living reefs of the same region and in Florida. 

 'In places, as in the Bahamas, it is one of the most important reef- 

 forming corals, its strong skeleton enabling it to withstand the pound- 

 ing of breakers. 



Genus ASTREOPORA de Blainville. 



1896. Astraeopora Bernard, Brit. Mus. Cat. Madreporaria, vol. 2, pp. 77-99. 

 1918. Astreopora Vaughan, Carnegie Inst. Washington Pul). 213, p. 145. 



Type-species. — Astrea myriophthalma Lamarck. 



astreopora GQPXHALSI, new species. 



Plate 140, figs. 3, 4, 4«. 



CoraUum composed of rather large, subterete, subeUiptical, or 

 much compressed branches. The following are measurements of 

 four broken branches: 



Measurements of branches of Astreopora goethalsi. 



> Width at bifurcation 22 mm. below upper end. 



Calices subcircular or more or less distorted. Diameter ranges 

 from 1 mm. in young, to 2 mm. in large calices, usual diameter from 

 1.5 to 2 mm. Distance apart from 1 to 1.5 mm. Calicular rims. 



