838 Report oF THE STATE GEOLOGIST. 
the beak and continuous beyond the anterior edge of the plate 
into long, slender and upwardly curving crura. Beneath the 
crura arises a broad, shallow, trough-shaped plate, which, near 
the apex, is supported by a short median septum resting on the 
valve. This process is strongly curved toward the opposite valve 
and is continued for most of its length beyond the termination 
of the median septum. Usually it widens outwardly, and then 
narrows rather abruptly, or even acutely, to its extremity. The 
adductor muscular scars are well developed in this valve, forming 
a broadly oval or subcircular impression. 
Vascular sinuses are sometimes retained on both valves. 
Type, Camarophoria Schlotheimi, von Buch (sp.) (Permian). 
Distribution. Devonian — Permian. 
Subgenus Camarophorella, Hall. 1893. 
. (Plate 45, figs. 5, 6.) 
Valves biconvex and subcireular; without median fold, sinus 
and plications, the surface being smooth and regularly arched. 
Internal characters normal for Camarornorta, except that the 
broad, spatuliform spondylium rests upon the valve for most of 
its length, the median septum penetrating it and projecting above 
it into the interior cavity of the shell. 
(Type, Camarophorella lenticularis, White and Whitfield (sp.). 
Burlington limestone.) 
Camarella, Billings. 1859. 
(Plate 45, figs. 138-19.) 
Valves full, convex, smooth about the umbonal region, but 
anteriorly developing a few low plications which are rather the 
more conspicuous on the median fold and sinus, and the fold, 
sinus and plications are clearly developed on the usually abrupt 
anterior slope. 
The pedicle-valve is the more convex up to maturity, but there- 
after the brachial valve becomes the deeper. The beak of the 
pedicle-valve is erect or slightly incurved and beneath it lies a 
triangular delthyrium which, so far as observed, shows, neither 
in @. Volborthi nor in C. Panderi, any evidence of deltidial plates. 
The cardinal slopes are abrupt and oblique, and no cardinal area 
is developed on either valve. On the interior are dental lamellz 
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