SWALLOW—DESCRIPTION OF FOSSILS. 645 
SprriFER TANEYENSIS, n. Sp. 
Shell very small, gibbous, subglobular, strongly plicate, 
cardinal extremities produced, submucronate. Ventral valve 
very gibbous, strongly arched from the beak to the anterior 
margin; area long, narrow, arched; foramen small; bea 
large, strongly incurved ; mesial sinus well defined, deep, nar- 
ow, simple. Dorsal valve smaller, less convex, more depres- 
sed towards the cardinal extremities; umbo large; beak 
small; mesial fold simple, narrow, high and rounded; cardi- 
nal line longer than width of shell, extremities arched to- 
wards the umbo of the dorsal valve. Surface marked with 
rom four to six simple, rounded plications, on each side of 
the mesial fold and sinus; those on each side of and next to 
the mesial sinus, much larger and higher; those on the dor- 
sal valve larger and one or two less in number. It is also 
Ona with numerous concentric subimbricating la- 
melle, 
Length, .88; breadth, .52; thickness, .32. 
This little fossil was discovered in the Chemung rocks of 
Taney county. 
SprrtrFerR MEEKII, n. sp. 
Shell small, gibbous, subangular. Ventral valve convex, 
regularly arched ; mesial sinus well defined, narrow, simple 
counties in Missouri. 
SPIRIFER LINEATOIDES, 0. SP- 
Shell ] i ly elliptical. Ventral 
arge, — ae urea inom fe arched to the 
valve most vs 
convex near the beak, ed to the set 
a * 
regularly convex; mesial fold broad, round 
elevated, Surface marked with numerous 
and granuliferous concentric bands. 
Length, 1.88 ; breadth, 2.51; thickness, 
pane” 
ery rare in the Encrinital Limestone of Missouri. 
