66 



EOCENE AND LOWER OLIOOGENE CORAL FAUNAS. 



Since F. pachyphyUum is the radical from which the other varieties are 

 derived, it appears that tlie species should bear that name, and the other 

 names be referred to varietal positions. The name ctmeiforme is the oldest, 

 and according to the law of priority it must stand for the species. 



It is quite probable that Flabellum johnsoni Vaughan is the ancestral 



form of this series. 



Flabellum sp. 



Prof W. B. Clark sent me six indeterminable specimens of a s^iecies 

 of Flabellum collected at Aquia Creek, Virginia. The specimens occur in 

 association with Eupsammia elahoraia (Conrad). 



Corallum compressed cuneiform, attached by a short pedicel, with 

 slightly developed marginal wings above the pedicel. The dimensions of 

 the two largest specimens, whose outer surface is unfortunately so very 

 much corroded that its detail is destroyed, are : 



Greater diameter of calice. 



I 



Lesser diametiT oC calice.. 



Height of corallum 



Mm. 



14 



9 



15 



Mtn. 

 13 

 7 

 14+ 



Distinct costal correspond to the larger septa. The number of the 

 septa was not determined with certainty, but is about forty. 



This may be a new species, but has a resemblance to some varieties of 

 F. ctmeiforme, especially to the older varieties of that species. 



Flabellum mortoni sp. nov. 

 PI. IV, tigs. 7 to 10. 



This is one of the species confused with ^^ Turbinolia" inauris Morton, 

 in the collection of the Academy of Natural Sciences of Philadelphia.' 



Corallum cuneiform, base small, edges and faces converging toward 

 it; cross section elliptical. The following gives the dimensions of a series: 



'Vide p. 171 of tliis paper. 



