164 Report or THe State GEOLOGIST. 
crowded, at others distant and lamellose ; occasionally the surface 
is coarsely papillose. Shell substance strongly punctate. 
Type, Cyrtina heteroclita, Defrance. Middle Devonian. 
Distribution. Silurian — Lower Carboniferous. 
Bittnerula, gen. nov. 
Shells small, cyrtiniform; exterior smooth, substance highly 
punctate. Umbo of the pedicle-valve deformed or cicatrized, 
evincing attachment in early growth stages. Interior of the 
pedicle-valve with a short median septum, attached to the valve 
for one-fourth the length of the latter, becoming free and 
Fies. 288-292. Bittnerula Zitteli, Bittner (sp.). (BrrTNER.) 
elevated toward its anterior extremity. This septum rises 
almost to the delthyrium where it joins two greatly abbreviated 
dental plates which thus form a transverse platform beneath 
the deltarium. 
Type, Bitinerula Zitteli, Bittner (sp.) 
Distribution. Trias. 
Spiriferina, D’Orbigny. 1847. 
(Plate 31, figs. 1-7.) 
Shells resembling Srreirer in external aspect; interiorly the 
pedicle-valve bears a median septum resting upon the bottom of 
fy 
Fig, 293, The jugum of Spiriferina Kentuckiensis, Shumard. 
the valve, its posterior portion lying between, but not united 
with the strong dental lamella. The process on the primary 
16 
