GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 223 



and Thysanus, have close relatives in the present Floridian fauna. 

 I have previously pointed out^ that this fauna contains no genera 

 at present confined to the Indo-Pacific, such as Placoirochus , Placo- 

 cyathus, Siylophora, Pocillopora, Antillia, SyzygophylUa, and Gonio- 

 pora, all of which occur in the West Indian Miocene, and all except 

 the first two also occur in the West Indian Oligocene or Eocene. 



LIMON, COSTA UICA. 



Certain corals collected in the vicinity of Limon are reputed to 

 come from a bed of Pliocene age. They are as follows: 



Madmcis mirabilis (Duchassaing and Michelotti). 



Archolielia limonensis Vaughan. 



Orhicella annularis (EUis and Solander) var. 

 cavernosa var. endotJiecata (Duncan). 

 var. cylindrica (Duncan). 



Except Archohelia limonensis, it appears that these corals might 

 represent the Santo Domingan Miocene above the Bowden horizon. 

 The material is not adequate for a positive opinion. 



CARRIZO GREEK, CALIFORNIA. 



Recently I liave described in detail an interesting small reef- 

 coral fauna from Carrizo Creek, Imperial County, California.^ 



The following table, taken from the paper mentioned, contains 

 the names of the species composing this fauna and of the most 

 nearly related species in Florida and the West Indies. 



Corals from Carrizo Creek, Cal. 



■vv-^. i Most nearly related species in Florida or West 



^^*™®- Indies. 



Eusmilia carrkensis yanghan I Eusmiliafastigiata(,Ta\\a.s), PI, R. 



Dichocoenia merriami (Vaughan) \\Dichocoema species, P; D. stokesi Milne Edwards 



var. crassisepto Vaughan \f and Haime, PI, R. _ 



Solenastrea fairbanksi (Vaughan). typical 



var . columnaris (Vaughan) 



[Solenastrea liyades (Dana)Jand S. bournoni Milne 

 (Edwards and Haime, P, PI, R.g 



Maeandra labyrinthiformls (Linnaeus), PI, R. 



var. normalis Vaughan 



var. minor Vaughan 



Maeandra bowersi Vaughan 



^'■'""^LnStvShlS^^^^^^^^ 



Siderastrea californica Vaughan 1 Siderastrea pliocenica Vaughan, P. 



Porites carrizensis Vaughan | Porites asireoides Lamarck, PI, R . 



P, Pliocene; PI, Pleistocene; R, Recent. 



Regarding the geologic age of this fauna, it was said : 



The specific affinities of the Carrizo Creek corals are discussed in detail after the 

 descriptions in the systematic part of this paper. The Carrizo Creek spe'cies are so 

 near species belonging to the same genera in the Pliocene Caloosahatchee marl of 

 Florida and in the Pleistocene and living reefs of Florida and West Indies that it 

 seems to me they can scarcely be so old as Miocene; lower Pliocene appears to be the 

 maximimi age which may be assigned to the fauna. 



1 The reef-coral fauna of Carrizo Creek, Imperial County, California, Prof. Pap. 98-T. p. 366, 1917. 



2 U. S. Geol. Survey Prof. Pap. 98-T, pp. 355-386, pis. 92-102, 1917. 



