PLATE 44. 
Legend: j. Cardinal process. a, Adductor scars. 
c. Crura. r. Diductor scars. 
v. Vascular sinuses. 
WILSONTA (QueEnstept), Kayser. 
Page 827. 
Witsonta Sarrornt, Hall. 
Figs. 1, 2, 8. Dorsal, ventral and anterior views; showing the character of the 
exterior. 
Fig. 4. Cardinal view of an internal cast of conjoined valves; showing the 
impressions left by the dental plates and the median septum. X 2. 
Fig. 5. The interior of a pedicle-valve; showing the teeth and the muscular 
area. X 2. 
Niagara group. Perry county, Tennessce. 
UNCINULUS, Baytz. 
Page 828. 
UncinuLus apropius, Hall. 
Fig. 6. Cardinal view of a brachial valve; showing the dental sockets; bilobed 
cardinal process and the elevation of the crura. X 2. 
Fig. 7. The samed viewed from above. * 2. 
Figs. 8, 9. Dorsal and front views of a typical example. 
Lower Helderberg group. Albany county, N. Y. 
HYPOTHYRIS, Kine. 
Page 828. 
Hyporuyris vENustuta, Hall. 
(= Rhynchonella cuboides, Sowerby.) 
Figs. 10, 11, 12. Cardinal, front and profile views of a typical specimen. 
Fig. 13. Ventral view of an internal cast; showing the vascular sinuses. 
Tully limestone. Ovid, N. Y. 
Puenax, Hall. 
Page 828. 
Puenax ExPLANaTus, McChesney. 
Figs. 14, 15, 16. Dorsal, profile and front views; from a sulphur cast of the 
original specimen. 
Kaskaskia limestone. ilinois. 
Puenax Uta, Marcou. 
Figs. 17, 18. Dorsal and front views of an average example. 
Fig. 19. A portion of the interior of the brachial valve; showing the broad 
hinge-plate. X 3. 
Coal measures. Manhattan, Kansas. 
244 
