■ Neiv Missouri Fossils. — Roivley. 265 
Shell sub-trigonal, length and width about equal. Bra- 
chial valve convex with a sharply defined mesial elevation 
and four or five angular costre, either side of the elevation. 
Pedicel valve convex with a broad, rather deep mesial sinus 
and four or five sharp costa; either side. Beak slender, in- 
curved. Four or five angular plications occupy both the 
sinus and the mesial fold. Indistinct lines of growth. The 
collection contains six specimens, collected from the soft 
cherts of the Lower Burlington limestone at Louisiana, Mo. 
Terebratula fabulites (nov. sp.). 
Plate V, Figs. 51, 52,53. Dorsal, ventral and profile \iews of the 
larger of the two types, natural size. 
Shell small, ovate, gibbous. Brachial valve convex, long- 
oval in outline, crossed by distinct lines of growth. Pedicel 
valve more convex than dorsal, oblong in outline. Beak- 
short, incurved, perforate. Lines of growth are the onl)- 
visible marks upon the surface. 
Two specimens only of this elegant little Brachiopod 
have been found, both from the soft cherts of the Lower 
Burlington limestones, Louisiana, Mo. 
Centronella emaciata (nov. sp.). 
Plate V, Figs. 48, 49, 50. Dorsal, ventral and profile views of the 
larger specimen, natural size. 
Shell subrhomboidal, length greater than the width. 
Brachial valve hardh' convex, with two shallow, lateral de- 
pressions near the front. Pedicel valve with shallow de- 
pressions but more pronounced than on the brachial valve, 
located laterally. Indistinct lines of growth cross the valves. 
Beak of pedicel valve long, slender and but slightly in- 
curved. Perforation at end. A smaller specimen has, from 
the middle of the brachial valve to the margin of tiie front 
end, a broad, shallow sinus or depression. A slight, scarceh- 
perceptible lateral depression on the same vahe. 
The pedicel valve is like that of the figured specimen 
except that the lateral depressions are more pronounced. 
This specimen has a sharp line of growth toward the back 
of the shell. But one other species of this genus occurs in 
