LIMESTONES OF WESTERN TENNESSEE 711 



Gypidula roeineri; ii\a, 16, 18, 34, Gant bed 46, i^eC, 39, 40, 15a. 



Conchidiutn littojii ; described from Hardin county ; identified by Safford 

 from the Meniscus horizon. 



Conchidium legoensis ; length, 29 to 31'nn'; width, 20 to 24"""; thickness, 16 to 

 j^ram. J 2 to 14 radiating plications; related to C. crassiplica\ 15a. 



Coiichidium lindenetisis ; in form and frequency of radiating plications most 

 nearly resembling C. colleti, but without frequent lines of growth, and 

 only 50""° long; not rare within 10 feet of base of section, east of house 

 of William Goodwin on Coon Creek, opposite road leading off to Linden ; 

 23- 



Plectainbonites, i species; Gant bed 44. 



Strophonella roemeri; profile resembling Fig. i,c, Plate 23, Vol. Ill, N. Y. 

 Pal.\ striae very fine and numerous in umbonal region, every fifth 

 •or sixth one distinctly more prominent ; the more prominent striae 

 become more numerous in the pallial region, 12 to 15 in a width of 10™™ ; 

 length 43""", width 60"™, outline triangular; about 35 feet above base of 

 Dixon bed at Brownsport Furnace, 16; Gant bed 46 ; 12, New Era. 



Strophonella prolo7igata \ width 31"", length 15°""; plications 18 to 21 in a 

 width of ID'"'" along anterior margin, numerous at beak; profile as in 

 Fig. 6c, Plate 23, Vol. Ill, N. V. Pal.; 16, 19a, Gant bed 44, 46, 39. 



Strophonella laxiplicatiis ; plications consist of sharp narrow ridges separated 

 by comparatively wide spaces, new plications are added along the middle 

 of these spaces. Comparatively few plications (usually less than 10) 

 begin at the beak. Related to Str. se7nifasciata, but plications more 

 numerous, more prominent, and shell much smaller; 16, 12, \\eC, 39. 



Leptaetia rhomboidalis ; 16, 14a, Gant bed, 46, \&,eC, 39. 



Orthothetes subplamis ; 12, 16, \\eA, \\eC, 40. 



Orthothetes roe77ieri ; plications fewer, separated by wider spaces ; shell much 

 smaller; 190;, Pegram. 



Dalmanella fissiplica ; 19a, 14a, 36, 49, 103, \\eA. 



Dalmanella elegantula \ only 1 1 ""m long, otherwise typical; 14a, lo^a, 35. 

 Larger form with usually finer striae, 20™" long; top at 16, \\eC, 39, 40. 



Dalmanella arcuaria ; 14a, 15, 16, 18, 46, 49, 103. 



Rhipidomella lenticularis ; resembles Rh. circtilus, but the stricE are much 

 more numerous, largest specimens 28'""" long; top at 16. 



Rhipidomella hybrida; variety, 12™'" long; \ii,eC, 38, 39, 40. 



Rhipidomella saffordi; length 8""™, dorsal valve strongly convex, but indented 

 along the middle by a distinct depression which begins at the beak and 

 is widest and deepest at the anterior margin; Gant bed 44, Pegram, 

 \\eC, 39. 



Bilobites biloba \ \\a, iga. 



Allocrinus typus ; Clifton and Decatur counties, 



Callicrinus {Eucalyptocrinus) ramifer; Wayne and Decatur counties. 



Caryocritius ornatus ; I4«, 16, 19a, 49. 



