PLATE Llir—Continued. 
CfELOspiitA Camilla, Hidl. 
Figs. 24-26. Dorsal, profile and ventral views of a typical specimen; showing the contour and surface char¬ 
acters. X 2. 
Fig. 27. The interior of the brachial valve : showing the elevated and somewhat recurved hinge-plate. X 4. 
Fig. 28. The intei-ior of a pedicle-vfilve; showing the open delthyrium, the teeth and muscular impres¬ 
sions. X 4. 
Corniferous limestone. Caledonia, N. Y. 
Fig. 29. The interior of a pedicle-valve ; showing characters similar to those of the preceding figure. X 2. 
Fig. 80. The exterior of a pedicle-valve. X 2. 
Fig. 81. The interior of a brachial valve ; showing the hinge-plate and median ridge. X 8. 
Corniferous limestone. Le. Roy, N. Y. 
CCELOSPIRA ACUTIPLICATA, Coilfad. 
Figs. 82-8:'). Dorsal, profile, ventral and frontal views of the exterior of a typical specimen ; showing the 
contoui', coarse, sharp plication and concentric lineation of the valves 
Corniferoirs limestone. Jamesville, N. Y. 
Fig. 86. 'I'he interior of a poi'tion of the bi-achial valve; showing the recurved hinge-plate, deep'(lenlal 
sockets and median ridge. X 8. 
Fig. 87. The exterior of a pedicle-valve slightly imjierfect about the margins. X 2. 
Fig. 88. The intei-ioi- of the same specimen ; showing the open delthyrium and teeth. X 2. 
Corniferous limestone. Waterloo, N. Y. 
Fig. 89. The intei'ior of a lirachial valve with faint lateral jilications ; siiowing the hinge-plate, dental 
sockets and median ridge. 
Corniferous limestone. Sangerfield, N. Y. 
Genus LEPTOCCELIA, Hall. 
' Page 136. 
LEPTOCaiLlA ELABELLPJES, Hall. 
Figs. 40-42. Dorsal, ventral and profile views of an average example ; showing the contour and surface 
charactei'S. 
Fig. 43. The interior of a brachial valve; showing the structure of the hinge-plate, dental sockets and 
musculai’ area. 
Fig. 44. A profile of a large shell ; showing the plano-convex contour. 
Fig. 4"). The inteiior of a bi'achial valve, somewhat imperfect about the margins ; showing a slight varia¬ 
tion of the characters as represented in fig. 43. 
Fig. 46. The carditial region of another In-achial valve, enlarged; showing the excavation of the cardinal 
process on either side of a median ridge, and the projection of the crural lobes. X 2. 
Fig. ,')8. The interioi- of a pedicle-valve ; showing' the open delthyrium, teeth, adductor and diductor scars. 
Oi'iskany sandstone. Ctcmberland, Maryland. 
LEP'rocaiLIA FIMHRIATA, Hull. 
Fig. 47. Dorsal view of the posterior portion of the shell; showing the fimbria of sjnnules or testaceous 
processes extending from between the cardinal mai'gins. X 3. 
Fig. 48. A pi'ofile of a brachial valve; showing the elevation of the cardinal process and crura. X 3. 
Fdg. 49. Cardinal view of a brachial valve; showing the elevation of the cardinal iirocess, socket-walls 
and crura, and the foreshortened cardinal spinules. 
Fig. 50. Dorsal view of conjoined valves ; showing the extei'ior characters and the cardinal spinules. X 8. 
Fig. 51. The interim'of a bi'achial valve; showing the structure of the articulating apparatus, the char¬ 
acter of the muscular area, and the marginal spinules which are inserted upon this valve. X 2. 
Fig. 52. The interior of a pedicle-valve ; showing the foramen, teeth and muscular area. X 2. 
Figs. 54, 55. Interiors of iiedicle-valves; showing some variation in the retention of the structural features. 
X 2. 
Oriskany sandstone. Oitmberland, Maryland. 
