PLATE XXV—Continued. j ; 
Leptodesma Orodes. 
Page 206. 
See Plate 90. 
Figs. 6, 9. Two left valves. The specimen tig. 9, is redrawn on pi. 90, fig. 8. 
Fig. 10. A large left valve somewhat distorted by pressure and referred to the species with doubt. 
Chemung group. Near Smethport, Pa. 
Leptodesma mytiliforme. 
Page 235. 
See Plate 91. 
Figs. 7, 11. A right and left valve. Other illustrations of these specimens are given on plate 91, figs. 22 
and 24, showing more clearly the specific characters. 
Chemung group. Near Smethport, Pa. 
Leptodesma Maclurii. 
Page 228. 
See Plate 91. 
Fig. 8. A right valve.. See fig. 14, pi. 91, for another figure of this specimen. 
Fig. 13. A left valve. Another figure of the specimen is given on plate 91, fig. 13. 
Chemung group. Near Smethport, Pa. 
Leptodesma rude. 
Page 221. 
. See Plate 91. 
Fig. 12. The left valve described. See fig. 3, pi. 91. 
Chemung- group. Near Smeth'port, Pa. * 
Glyptodesma erectum. 
Page 153. 
See Plates 11,12, 13, 86 and 87. 
Fig. 14. An internal mould of the upper portion of a left valve showing the lateral teeth and striated 
ligamental area. The large scar on the post-umbonal slope was probably made by the 
attachment of a Crania to the shell and covers a portion of the large muscular impression. 
Hamilton group. From a boulder near Nichols, N. Y. 
Fig. 15. An internal cast of a right valve, showing the pallial line and imprint of a strong posterior tooth. 
Hamilton group. Otsego Co., N. Y. 
Figs. 16, 17. A right and a left valve as preserved in a cherty limestone. 
Hamilton group. Indiana. 
Pal,eopinna FLABELLA. 
Page 240. 
See Plate 87. 
Fig. 18. The left valve described. See plate 87, fig. 4. 
Oriskany sandstone. Schoharie, N. Y. 
Paljeopinna recurva. 
Page 241. 
Fig. 19. A view of a large imperfect left valve. 
Upper Helderberg group. Stafford, Genesee Co., N. Y. 
