1884.] NATURAL SCIENCES OP PHILADELPHIA. 321 



NOTES ON SOME NEW FOBAMINIFEBA FROM THE NUMMULITIC 

 FORMATION OF FLORIDA. 



BY PROFESSOR ANGELO HEILPRIN. 



Since the publication of my paper on Nummulites Willcoxi 

 Heilprin (Proc. Acad. Nat. Sciences, July, 1882 ; reprinted in my 

 " Contributions to the Tertiary Geology and Paleontology of the 

 United States," Phila., 1884), in which the existence of a true 

 Nummulite in the rocks of the North American continent was first 

 indicated, I have had the good fortune to have passed under my 

 supervision an extensive series of the Florida nummulitic rock. 

 In these, for which I am indebted to the kindness of Mr. Joseph 

 Willcox of this city, I have detected a considerable number of 

 foraminiferal forms which have not hitherto been recognized, I 

 believe, as occurring in the United States Tertiaries, but which 

 are usually present in larger or smaller quantities wherever the 

 nummulitic formation is largely developed. Among these, as 

 coming from Hernando County, are the genera Heterostegina. 

 Sphaeroidina, Biloculina (?), Triloculina^ Quinqueloculiiia, and 

 Spiroloculina. The genus Orbitoides is very abundantly repre- 

 sented in two or more species, one of which, unmistakably the 

 0. ephippium (0. sella), so distinctive of the Oligocene portion 

 of the European Terrain nummulitique, appears pre-eminent for 

 its lai'ge size. The great development of this species, irrespective 

 of all other evidence, would almost be sufficient by itself to 

 determine the age (Oligocene) of the rock formation in which it 

 occurs. 



Associated with these forms are very considerable numbers of 

 the Nummulites Willcoxi, and also a second species of the same 

 genus of very much larger size. In it the whorls 

 expand very rapidly in size, and the septa, in addition 

 Nummulites to being Comparatively more numerous, are consider- 

 FioridensM. ^^^^y more flcxcd than in the commoner species. The 

 test measures between one-third and one-half of an inch in diam- 

 eter. I propose naming this species Nummulites Floridensis, 

 although I am by no means satisfied that it may not prove to be 

 identical with one of the many closely related forms that have 



