322 



PROCEEDINGS OF THE ACADEMY OP 



[1884. 



been described from the south of Europe, the West India Islands, 

 and elsewhere. Only an actual comparison of specimens can, in 

 most instances, determine specific identity 

 or variation in the case of this most diffi- 

 cult group of organisms. Pending the in- 

 terval which must of necessity intervene 

 before such comparison can be made, I 

 have deemed it the safer plan to describe 

 and name the species, subject to revision. 

 A new locality for Nummulites Willcoxi 

 has been found by Mr. Willcox, situated 



Nummnlites Willcoxi. 



1. Natural size ; 2. Enlarged, some fifteen milcs to the northeast of the 

 locality on the Cheeshowiska River, whence the species was orig- 

 inally obtained. Here the rock masses containing the fossils 

 lie in situ, and at an elevation of not less than 150 feet above the 

 sea. The existence of a true nummulitic basement formation in 

 the State of Florida is thus placed beyond question, and, doubt- 

 less, the same will be found to have a very considerable extension 

 inward. 



No specimens of the Operculina rotella (= Operculina com- 

 planata f) have been detected in this newer series of rock frag- 

 ments. 



