PLATE 45. 
Legend: d. Spondylium. s'. Septa (brachial valve). 
s. Septum (pedicle-valve). a. Adductor scars. 
CAMAROPHORIA, Kune. 
Page 837. 
CaMAROPHORIA suBrRIGONA, Meek and Worthen. 
Fig. 1. Ventral view of an internal cast; showing the contour of the shell, the 
denticulate margins of the valves on the broad cardinal slopes, the 
sharply serrate anterior and lateral margins and the cavity left by 
the spondylium and median septum of the pedicle-valve. 
Chert of the Burlington limestone. Burlington, Iowa. 
Fig. 2. Internal cast of pedicle-valve; showing the form of the muscular 
impression. 
Keokuk group. Nauvoo, Illinois. 
CAaMAROPHORIA SUBCUNEATA, Hall. 
Fig. 3. A portion of the interior of the pedicle-valve, showing the spondylium 
supported by a median septum. The summits of the teeth have 
been broken, showing their lateral union with the walls of the shell. 
xX 2, 
Fig. 4. Profile view cf a mature and gibbous shell, showing the character of 
the plication and the broad, concave cardinal slopes. 
St. Louis group. Washington county, Indiana. 
CAMAROPHORELLA, Hatt. 
Page 838. 
CaMAROPHORELLA LENTICULARIS, White and Whitfield. 
Fig. 5. An internal cast of the brachial valve; showing the impressions of 
spondylium and median septum. In this valve the spondylium is 
flat and the supporting septum penetrates it, extending for a short 
distance into the interior cavity of the shell. * 2. 
Fig. 6. A cardinal view of an internal cast of the pedicle-valve; showing the 
filling of the spondylium and the cavities left by the median septum 
and the oblique dentai plates. 2. 
Yellow sandstones of the Burlington group. Burlington, Iowa. 
SYNTROPHIA, Hatt. 
Page 837. 
SYNTROPHIA LATERALIS, Whitfield. 
Fig. 7. The exterior of a pedicle-valve; showing the long, straight hinge and 
broad median sinus. 
Fig. 8. The exterior of a brachial valve; showing the obscure median fold. 
246 
