64 EOCENE AND LOWER OLIGOCENE CORAL FAUNAS. 



Flabbllum cuneiforme var. wailesi Courad. 



PI. Ill, flgs. 22 to 23a; PI. IV, figs. 1 to ;3a. 



1855. Fhthellnm wailesi Coiiriid. I'roc. Acad. Nat. Sci. Pbila.; VoL YII, p. 263. 



ISOG. Flabellum wailesi Conrad. Check List, p. 21. 



1886. Flabellum wailesi f Aldrich. Prelim. Rept. on Tert. Foss. of Ala. and Miss., p. 49. 



18!I0. Flabellum irailrsi de Gregorio. Mon. de la Faune (-ocenique de I'Ala., p. 256. 



1894. Flabellum tvailcsi Harris. Tert. geol. south. Ark.: Ann. Rept. Geol. Siirv. Ark.. 



1892, Vol. II, p. 172. 



1895. Flabellum. cuneiforme var. wailesi Vaughan. Am. Geol., Vol. XV, p. 223. 



1896. Flabellum cuneiforme var. wailesi Vaughan. Bull. U. S. Geol. Survey No. 142, 



p. 51. 



This variety may be recognized by its size, which is usually larger tlian 

 the other varieties of the species, by its very thin wall, its very thin septa, 

 and its thin epitheca. Impressed lines radiating from the pedicel and 

 corresponding to the septa are seen beneath the epitheca. The epitheca 

 is frequentl)" broken away. Crossing the ends of the septa are minute 

 transverse lines of growth, as illustrated in PI. Ill, iig. 23a. Conrad in 

 his original descrijition mentioned "the imjjressed radiating lines." 



The sides usually diverge at a greater angle than is usual in F. cuneiforme. 

 In the collection of the Philadelphia Acadeni}' of Natural Sciences there is a 

 variety of this form labeled in maimscript by Conrad "jP. percarinatitiii." It is 

 subtriangular in outline, is slightly more elongated than is usual in the variety, 

 and the costa^ in the midiUe of the faces are rather large. A subvariety is 

 almost conical and ([uite slender. (See PI. IV, figs. 3, 3a.) 



Localities.- — Jacksou and Vicksbitrg, Mississippi; Montgomery, Louisiana; 

 three-quarters of a mile above Vinces Bluff, Saline River, Arkansas; Ham- 

 maker's well, sec. 8, T. V2 S., R. 9 W., Arkansas: Wadworth's well, Long 

 Prairie, Arkansas.' 



Geologic occurrence. — Jacksouiau aud Vicksliurgiau stages. 



This variety of F. nineiformi' bears considerable resemblance to Flabelliun 



sedecimcostatum Sokolow.' Dr. Sokolow has kindly compared specimens of 



l)oth, and writes me that he finds the following points of difference: 



All the specimens of Flabellum from Jekaterinoslaw are more compres.sed from 

 the sides (von Seiten mehr gedrii(dct) and also more conical; the edges of the calices, 

 and therefore the lines of growth also, are decidedly less curved than in Flabellum 



'Ark. localities, fide Harris, vide op. sup. cit. 



-Die unteroligociine Fauua der Glaueonitsaude bei der Eisenbahubriii-ke vou Jekaterinoslaw : 

 U^m. du Comit<3 Gcologique (Russia), Vol. IX, No. 3, 1894, pp. 100-101, fig. 13 (in Text), pi. ii, 

 tigs. 2a, b, c. 



