ANASTROPHIA DEFLEXA, Sowerby. 
Fig. 33. Cardinal view of a specimen which has been transversely sectioned in 
the umbonal region; showing the supported spondylium of the 
pedicle (lower) valve, and the septal plates of the brachial valve, 
bearing the crural apophyses. 
Wenlock limestone. Island of Gotland. 
Fig. 34. Profile of a normal adult example; showing the surface plication and 
the predominant convexity of the brachial valve. 
Wenlock limestone. Wenlock Edge, England. 
LYCOPHORIA, Lauusen. 
Page 842. 
LycorHoria NucELLA, Dalman. 
Fig. 36. A longitudinal median section of the two valves; showing the 
thickening of the umbonal region of the brachial valve and the pro- 
jection of the cardinal process into the umbonal cavity of the pedicle- 
valve. 
Figs. 37, 38, Dorsal and profile views of a finely plicated, orbicular specimen. 
In fig. 37, the muscular area is faintly outlined through the sub- 
stance of the brachial valve. 
Fig. 39, Cardinal view of specimen transversely sectioned in the umbonal 
region, the pedicle-valve being above; showing the dental plates and 
erect, bifurcate cardinal process. X 2. 
Lower Silurian. Near St. Petersburg, Russia. 
PORAMBONITES, Panpzr. 
Page 840. 
PoRAMBONITES £QUIROSTRIS, Schlotheim. 
Figs. 40, 41. Profile and front views of a ventricose shell; showing the relative 
convexity of the valves and the development of median fold and 
sinus. 
Fig. 42, Cardinal view of a specimen showing the cardinal area on each valve 
and, by translucence, the double septa of each valve. x 2. 
Fig. 48. A portion of the interior of the pedicle-valve; showing cardinal area, 
delthyrium and teeth. 
Lower Silurian. Russia. 
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