1878.] 29 {Rathbun. 
ence is greatly indebted for his constant support of the best interests 
of the Geological Commission. 
Spirifera, sp. indet. 
There is a single large dorsal valve of a Spi:ifera, which bears 
some resemblance to those varieties of S. granulifera of the Hamil- 
ton group, having the cardinal extremities rounded. ‘The surface 
arches strongly and regularly from side to side, and also strongly 
from the front margin to the beak, which latter.is prominent and 
strongly incurved. There is no flattening at the cardinal extremi- 
ties. Near the beak the fold is narrow, low, rounded, and marked 
with a slight longitudinal depression along the middle. The hinge 
line is slightly shorter than the width of the valve. There are, on 
each side of the fold, thirteen or fourteen very low, rounded, almost 
flattened plications, which are rather closely arranged, and the sur- 
face is also marked with several rather strong lines of growth. The 
width of this specimen is about 50 mm., length 38 mm. 
Devonian sandstone, Ereré. (Geol. Comm., 1876.) 
Spirifera Valenteana Hartt, MS. 
Rathbun, Bull. Buff. Soc. Nat. Sci., 1, no. 4, p. 241, pl. vir, 1874. 
Of this species only one specimen has been found, the one from 
which the original description was made. Devonian sandstone, 
Ereré. (Morgan Ex., 1871.) 
Spirifera Harttii, sp. nov. 
Shell rather above the medium size, transverse, and with the pro- 
portions of length to breadth about as 7 to 11; in outline transversely 
subelliptical; hinge line slightly shorter than the width of the shell; 
cardinal extremities rounded, the greatest width of the shell being 
slightly anterior to the hinge line. 
Dorsal valve moderately convex, the surface rising with gentle, 
regular curvature from the front margin to near the beak, toward 
which it bends abruptly downward, causing the beak to be somewhat 
flattened or apparently pressed down from behind. The valve is 
slightly flattened at the cardinal extremities and for some distance 
inward close to the hinge line, in front of which the umbonal region 
is strongly inflated over a great width. From side to side, across 
the middle, the curve of the surface is rather gentle and quite regu- 
lar. The median fold is distinct quite to the beak, but on the poste- 
rior portion of the valve it is not much elevated above the general 
surface; it increases only gradually in height, but quite rapidly in 
width, its width at the front equalling about one-fourth that of the 
