PLATE LIX—CoutinueU. 
Liorhynohus globulifoumis, Vaiiuxeni. 
23. The exterior of the brachial valve ; showing its rotundity, the low, faintly plicated fold and smooth 
convex lateral slopes. 
Hamilton group. Otsego county, N. T. 
24. The exterior of a jiedicle-valve with traces of marginal plications on the sinus. 
25. An internal cast of a more orbicular shell with stronger median plication. 
Black shale (Genesee shales). Lexington, Indiana. 
26. An internal cast of the bi-achial valve; showing the extent of the median septum and the form of 
the adductor scai’s. 
27. Enlargement of the umbonal portion of an internal cast of the brachial valve ; showing the filling 
of the dental sockets and spondylium, the cavities left by the removal of the hinge-plate and 
thickened median septum. 
Chemung (?) group. Broome coimty, N. Y. 
Liorhynohus castaneus, Meek. 
Figs. 28, 29. Profile and dorsal views of a well preserved individual; showing the great convexity of the 
bi'achial valve, and the exceedingly obsciii’e plication visible only on the median fold. 
Lower Devonian. Bureka District, Nevada. 
Liorhynohus robustus, sp. nov. 
Figs. 30, 31. Cardinal and ventral views of a very sharply marked internal cast of large size, representing 
an hitherto undescribed species; showing the muscular impressions of both valves and the 
vascular sinuses in the pedicle-valve radiating from the impression left by an umbonal testace¬ 
ous callosity. 
Chemung gi-oup. Steuben county, N. Y. 
Liorhynohus Kelloggi, Hall. 
Figs. 32, 33. Dorsal and ventral views of an adult shell with more distinct plication than that represented 
in figures 19, 20. 
Hamilton group. Northern Ohio. 
Liorhynohus Lesleyi, sp. nov. 
Figs. 34-36. Dorsal, ventral and profile views of a mature shell; showing the rather obscurely defined fold 
on the eonvex^brachial valves, the deep sinus of the pedicle-valve, and the unusually complete 
plication of the lateral slopes. 
Upper Devonian. Pennsylvania. 
Ihorhynohus JS'eavberryi, Hall aiul VVhittield. 
Fig. 37. An inteimal cast of the brachial valve ; showing the large size of the shell, low median fold, and 
fine plication. 
Fig. 38. Cardinal view of an incomplete internal cast of both valves. 
Upper Devonian. Kelloggsville, Ohio. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
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