GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 503 



PORITES ASTREOIDES Limarck. 



1816. Pontes astreoides Lamarck, Hist. iiat. Ardm. sans Vert., vol. 2, p. 269. 

 1887. Pontes astreoides Rathbun, U. S. Nat. Mas. Proc, vol. 10, p. 354. 



1901. Pontes astreoides Vauohan, U. S. Fish Com. Bull, for 1900, vol. 2, p. 317, 



pi. 32; pi. 33; pi. 34, figs. 1, 2. 



1902. Porites astreoides Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 



160, pi. 31, fig. 4. 



1902. Porites verrilli Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 161, 



pi. 31, fig. 5. 



1903. Porites astraeoides Duerden, Nat. Acad. Sci. Mem., vol. 8, p. 550, pis. 3-5, 



figs. 28^2. 

 1912. Porites astreoides Vaughan, Carnegie Inst. Washington Yearbook No. 10, 

 pp. 148-156, pi. 4, figs. 3a, Sd, 3e; pi. 5, figs. 5h, pi. 6, figs. Ic, 2e. 



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



1916. Porites astreoides Vaughan, Nat. Acad. Sci. Proc, vol. 2, p. 98. 



1916. Porites astreoides Vaughan, Carnegie Inst. Washington Yearbook No. 12, 

 pp. 226, 227, 228, 231. 



This is one of the coral species to which I devoted much attention 

 during my field studies in Florida and the Bahamas. The results of 

 my observations and experiments have mostly been published in 

 Yearbook Nos. 7 to 14, inclusive, of the Carnegie Institution of 

 Washington. 



Localities and geologic occurrence. — Canal Zone, Pleistocene, station 

 6039, Mount Hope, collected by D. F. MacDonald. This species is 

 general in both the living and the Pleistocene coral reefs of the 

 Caribbean region and Florida. It is also found living both in the 

 Bermudas and on the Brazilian reefs.^ 



I collected in the Miocene La Cruz marl in and near Santiago, 

 Cuba, a number of specimens of a massive species of Porites that I 

 can not distinguish from P. astreoides. The station numbers are 

 3436 and 3438, south side of the city along the trocha; 3446, first 

 deep cutting east of La Cruz, along the railroad. 



PORITES PANAMENSIS, new species. 



Plate 148, figs. 1, 2, 3, 3a. 



The type is the upper part of a plate, which is 90 mm. tall, 75 mm. 

 wide, and 28 mm. in maximum thickness near the lower end. One 

 side is nearly flat, while on the other there are two low gibbosities. 

 (See pi. 148, fig. 3.) 



Cahces excavated but not very deep, circmnscribed, 1.5 to 2 mm. 

 in diameter, or confluent in short series of about three calices. Wall 

 coarse, rather ragged in appearance, forms a considerably interrupted, 

 usually straight, occasionally zigzag, elevated ridge with coarse knots 

 along its top. As asexual reproduction is largely by fission, there 

 are no definite walls between many calicinal centers. 



1 Verrill, Conn. Acad. Arts and Sci. Trans., vol. 11, p. 161, 1902. 

 37149— 19— Bull. 103 21 



