58 EOCENE AND LOWER OLIGOCENE CORAL FAUNAS. 



Measurements of three specimens are as follows: 



Greater transverse diameter of calice. 

 Lesser transverse diameter of calico.. 



Height of corallum 



Depth of calice 



2{m. 



17.75 



u.r, 



Mm. 



12 



9 



10 



3fm. 

 10 

 9 

 13.3 



a PI. Ill, fig. 1. ''PI. Ill, tig. 2. 



Localities. — Prairic Creek and Matthews Landing, Alabama. 



Geologic occurrence. — Black Bhifif (Sucanioohee) and ^Matthews Landing 



(Nalicola) beds. 



Types. — United States National Museum. 



No other species of Flabellum known to me presents the characters out- 

 lined above. The subconical form without any sharp angle at the termini 

 of the longer transverse axis of the calice and complete absence of any 

 lateral processes are the most salient eharacters. 



Flabellum conoideum var. matthewsense var. nov. 

 PI. Ill, tigs. 5 to 6a. 



Differs from typical F. conoideum in having well-developed costa^, cor- 

 responding to the first and second cycles of septa, but grades directly into 

 the typical form of the species. 



All of the specimens of this variety that were examined have only 12 

 principal septa each. The ej)itheca is decidedly of the character of that 

 of F. Irrchi. It is highly i)robable that the latter species is a descendant of 

 tliis variety. 



Locality. — Mattlicws Laiidiiig, Alabama. 



Geologic occurrence. — Mattlicws Laiidiug (Naheola) beds. 



Types. — From collection of Mr. T. H. Aldrich in tlie LTnited States 

 National Museum. 



Specimens. — In collectioiis of Wagiicr Free Institute of Science, Phila- 

 del])hia. 



Tiie coral oljtained by Mr. Harris from the Midwayan stage of southern 

 Arkansas, and noted by him in his Tertiary Greology of Southern Arkansas,' 

 pages 49 and 54, pi. iii, hg. 6, seems from the figure to lie a conical- shaped 

 Flabellum. The figure shows three cycles of costse, the first cychj being 



I Ann. Kept. Geol. Surv. Arl;. for 1S92. 



