LIMESTONES OF WESTERN TENNESSEE 713 



Cladopora reticulata; 27. 



Coenites verticillata; 27. 



Ditoecholas7na {^Petraia) fanningaita ; i^a, 15, 16, iga, 4g, id^eC, 39^. 



Enterolasma {Petraid) waynetise; 14a, 16, 19a, 46, 49, 36, \\eA, \\eC, \\eE. 



Eridophylhim proliferum\ related to E. senium, but corallites free, not con- 

 nected laterally ; the calyx of mature specimens not often seen, because 

 usually filled by young corallets, invariably 4 corallets in each calyx; 16. 

 27, 3ga. 



Favosites cristatus; i/^a, 15, 16, 27, 46, I4^C, 40. 



Favosites cristattis major \ 14a, 27, 46, 49. 



Favosites discoidea; i\a, 16, 19a: 32, 35, 49, Pegram, \\eC. 



Favosites discus; 27, top of 16. 



Favosites favosus ; 16, 15, Pegram. 



Favosites niagarensis \ 27,39a. 



Favosites spongilla; 16,27. 



Favosites obpyriforniis ; growth globose or inversely pear-shaped, 12'^'" in 

 height ; corallites 3 to 4™™ in diameter ; 17. 



Halysites catenulatics \ 27. 



Heliolites subtubulatus; 27, 16, 103. 



Omphytna verrucosa \ 16. 



Laccophyllum acuinitiatuvi ; Perry county, i\a, 16, 3912. 



Plasmopora follis \ 16, 27, 103, 38, 39a. 



Platyaxum platys; corallum forming flat, very thin (i to 3""") fronds, which 

 are irregularly lobate; corallites very oblique; apertures sinuate, cen- 

 tral part elevated, the sides adnata to the frond; probably congeneric 

 with Alveolites ; 15 corallites in a with of 10"""; 16,27. 



Striatopora; related to 'iX.x. Jiexuosa; 12, 14a, 19, 19a, 16. 

 Thecia major; \\a, 27, 39a 

 Thecia swindernatia; 15, 16,27. 



Ptychophylhmi vulcanius ; coral 65"" wide, thin at the edges, 4""™ thick 

 17""" from the center, maximum height 15'"™ at 6""" from the center, 

 about 10""" at the center. Top of coral fiat; the base is not preserved, 

 but, judging from what remains, its sides once spread at an angle of 

 more than 45°, until it reached a diameter of about 35""", and then it 

 spread almost horizontally. A basal view suggests the appearance of a 

 model of a low volcano, with a distinct crater at the center. The septse 

 from this side have a striking resemblance to those forming the calyx in 

 Ptychophyllum ipomoea ; 36. 



Astraeospongia me?iiscus ; 14^, 14^, 22, 20, 35, 37, 43, 44, 46, 49, 102, 103, 

 i/^eA, i^b, 



Anomoclomella zitteli; Decatur county. 



Astylomanon cratera {^Palaeomanoii) ; figured by Roemer in his monograph of 

 West Tennessee fossils on Plate i ; to Figs. 4 and \a must be added also 

 Figs. I and \a on the same plate, according to Rauff. The following 



