PLATE LXXXII. 
(Figures l-G, 10-13, IS, 22, 23, 25, 26 by Cl. B. SiMPSON ; 7, 24 by E. Emmons ; 8, it, 11-17, lil-Jl, 27-38 by K. B. W'lin I'lKLD.) 
Genus CGELOSPIRA, Hall. 
Page 136. 
CCELOSPIRA HEMISPHERICA, yovveiby. 
Figs. 1, 2. Exteriors of two pedicle-valves; showing the contour, character of plication and concentric 
striae. 
Figs. 3, 4. Exteriors of brachial valves. 
Clinton group. Western New Ym-k. 
CcELOSPIRA PLICATULA, Hull. 
See Plate 52. 
Fig. 5. The interior of a portion of the brachial valve; showing the divided hinge-plate and median 
ridge. X 2. 
Clinton group. Wayne county. New Yark. 
Genus ATRYPINA, gen. nov. 
Page 161. 
Atrypina Clintoni, sp, nov. 
See Plate 53. 
Fig. 6. The exterior of a pedicle-valve. X 2. 
Clinton group. From a boulder ; Western New York. 
Genus ANABAIA, Clarke. 
Page 141. 
Anabaia Paraia, Clarke. 
Fig. 7. An internal cast of the brachial valve ; .showing the impression of the cardinal jirocess and the 
marginal elevation of the median fold. 
Middle Silurian. Rio TrombRas, Brazil. 
Genus VITULINA, Hall. 
Page 138, 
VlTULINA PUSTULOSA, Hull. 
Fig. 8. The exterior of a pedicle-valve of an average specimen. 
Fig. 9. The exterior of a bi'achial valve. 
Fig. 10. Ventral side of an internal cast; showing the impressions of the teeth, adductor and di<luctor 
muscles. X 2. 
Hamilton shales. Western New Yoi'k. 
Fig. 11. Ventral view of a preparation ; showing three volutions of the spiral cone which is dii-ected towaril 
the lateral margin of the shell. 
Hamilton shales. Alden, New York. 
Figs. 12, 13. Interiors of brachial valves ; showing- the cardinal ju-ocess and low- crui-al plates. 
Middle Devonian. Erere, Brazil. 
