Phosphate-Bearing Rocks. — Safford. 
107 
apex which articulates with the ventral valve. Shells smooth 
or plicate ; structure impunctate. 
Kayseria, Davidson 1882. 
Diplospirella, Bittner 1890. 
Euractinella, Bittner 1890. 
Pexidella, Bittner 1890. 
Anisactinella, Bittner L890. 
C. Subfamily Koninckinin^e, Waagen 1883. 
Amphiclininje, Waagen 1883; Diplospida? and Diplospirida>, Munier- 
Chalmas, 1880. 
Loop and spirals essentially as in Diplospirinai. The spirals 
in Koninckininas, however, are not laterally directed as in the 
former group, but point ventrally, which is due to the stropho- 
menoid form of the shell. Cardinal areas more or less well 
developed. Shells smooth ; structure impunctate. 
Koninckina, Suess 1853. 
Amphiclina, Laube 1865. 
Koninckella, M.-( 'halmas 
1880. 
Koninckodonta, Bittner IS'.):;. 
? Thecospira, Zugnieyer 1880. 
V Amphiclinodonta, Bittner 
1890. 
B a . Subfamily Meristellinje, Waagen lS ( s:5. 
The loop bifurcations do not enter the spirals, but recurve 
and join near their origin. Shells smooth; structure impunc- 
tate. 
Meristella, Hall 1860. 
Charionella, Billings 1861. 
? Pentagonia, Cozzens 1846. 
Goniocoelia, Hall 1861. 
Dicamara, Hall and Clarke 
1 893. - 
('. S. National Museum, I tree mhv i\ 1893 
Merista, Suess 1851. 
Camarium, Hall 1859. 
Dioristella, Bittner 1890. 
V ( 'amarospira. H. and 
1893. 
('. 
PHOSPHATE-BEARING ROCKS IN MIDDLE TEN- 
NESSEE. —PRELIMINARY NOTICE. 
By J. M. Saffobd, State GeologiBt, Nashville. 
Within the highland belt of country lying west of the me- 
ridian of Nashville, and between that and t In- Tennessee river, 
the phosphate-bearing beds associated with the Black Devo- 
nian shale are just now at t rael ing attention on accounl of the 
prospect of finding certain parts of them rich enough in 
phosphate material to he of e< mic importance. There are 
