274 5. AVELLER FAUNA OF THE FERN GLEN FORMATION 



more elongate form, in the smaller angle of divergence of the sides of 

 the corallurn, and in the more oblique position of the calycinal rim. 



BEAUHOXTIA AMERICAXA n. sp. 



Plate 10, figures 3-4 



Description. — Corallurn compound, corallites prismatic, variable in 

 size, the larger ones in the type specimen having a maximum diameter of 

 about 8 millimeters and the smaller ones not exceeding 3 millimeters in 

 diameter. Distally the corallites have some tendency to separate and to 

 become more or less subcircular in cross-section. Epitheca marked by 

 more or less irregular transverse wrinkles and sometimes by exceedingly 

 indistinct longitudinal costs. Internally the corallites are more or less 

 filled with vesicular tissue usually consisting of incomplete tabula) which 

 are rarely or never horizontal in position. Septa obsolete. 



Remarks. — The genus Beaumontia has not hitherto been recognized 

 in the Mississippian faunas of America, although it is apparently not un- 

 common in England. The members of the genus resemble Favosites in 

 habit of growth, but lack the perforations of the walls which are so char- 

 acteristic of that genus. Of the species here described only a few frag- 

 mentary colonies have been observed, the dimensions of the largest one. 

 being about 38 millimeters by 22 millimeters: consequently the form of 

 the complete colony is unknown. 



FAVOSITES TALMEYEREXSIS n. sp. 



Plate 10, figures 1-2 



Description. — Corallurn forming more or less cylindrical masse? 

 slightly tapering above, growing upon crinoid stems. Corallites variable 

 in size, attaining a maximum diameter of about 3 millimeters, the pri- 

 mary ones procumbent at first and then bending outward, the secondarv 

 ones occupying the angles between the primary ones and increasing 

 rapidly in size. "Walls of the corallites rather thin, pierced by numerous 

 circular mural pores of moderate size. Endothecal structures not 

 strongly developed, consisting of very thin more or less incomplete 

 tabula?, rarely extending more than half the diameter of the corallites. 



The dimensions of a large corallurn. but still incomplete, are : Length, 

 TO millimeters: greatest width, 29 millimeters. 



Remarks. — This species is a close ally of F. parasitica Phillips, from 

 the Carboniferous limestone of England. It differs from that species in 

 the form of the corallurn. which is more or less cylindrical, the British 

 examples being subglobular. The larger specimen, which has been illus- 



