LIMESTONES OF WESTERN TENNESSEE 7^9 



Cypricardinia, i species ; Gant bed 46. 



Cypricardinia? , i species; small, related to C. CasweUi; 18. 



Pterinea, i species; 16. 



Cyclojiema tennesseetisis ; not identified ; type specimens found within several 

 miles of Dixon Spring ; iqa. 



Holopea, i species ; cast, 46. 



Platyceras niagarense ; 14a, 19a, 49. 



Platyceras, browftsportensis vertically compressed at margin, more than in 

 PI. sinuatum\ 12, 16, \\eC. 



Diaphoro stoma {^Platyosto7na) niagarense; \\a, 15, 16, 19^, 46, 49, i^eA, 

 i^eC, 40. 



Platyostoma, i species; general aspect that of a Cyclonema\ 12, 16, 18, 



Dictyonella gibbosa ; Gant bed, 44, 46, 47 ; described by Hall from Perry 

 county. 



Dictyonella concinna ; described by Hall from Perry county. 



Dioryonella reticulata, 40. 



Meristifta maria roemeri; 15, 16, 19, 46, Pegram, 40. 



Merista tennesseensis \ 12, 16, 19, Gant bed 46, i/^eA, ii\eC, 39, 40. 



Trematospira simplex; largest specimens 18'"™ long; common at 12, 16, 

 I4,?C, 40. 



Trematospira, i species ; 6'""' long, with general outline and form of T. 

 tennessee7isis, but much smaller; Gant bed 44. 



Homoeospira schucherti; largest specimen 13""" in length, both valves with 

 narrow median depression occupied by i or 2 narrow plications; type 

 from Brownsport, 12, top 16, 18, 19, 44, 46, 47, 141?//, \i,eC, 39, 40. 



Homoeospira sobrina ( ? ); i4i!?C, 38, 40. 



Homoeospira beecheri; largest specimen 8""" in length; shallow depression 

 of ventral valve occupied by 2 plications slightly smaller than the rest; 

 bottom of median furrow of dorsal valve occupied anteriorly by 2 nar- 

 row striae, which are the bifurcated top of a low plication easily over- 

 looked ; type from Brownsport, 16. 



Anoplotheca{Coelospira)saffordi; length 5"""; ventral valve strongly convex, 

 with 3 plications forming an indistinct median elevation, and with 3 dis- 

 tinct and I or 2 indistinct plications on each side; dorsal valve concave, 

 especially anteriorly along the shallow median depression ; depression 

 occupied by 2 plications close together, more widely separated from 

 the neighboring plications; Gant bed at 44, i^eC, 39. 



Nucleospira concentrica; Gant bed, 44, 47 ; type from Decatur county, quoted 

 by Whitfield and Hovey from Meniscus beds of Decatur county, and by 

 Safford from Bath Springs in Decatur county; \\eA, \\eC, 39, 40. 



Nucleospira, i species; probably //^z/ctww ; 14, Gant bed 44, i/[eA. 



Cyrtia cliftonensis; height of cardinal area 6""", width 10"""; margins of 

 smus of ventral valve distinct and angular, diverging at an angle of 52°, 

 resembling C meta ; i \a. 



