GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE CHEMUNG GROUP. 



No. 60. — No. 119, page 264. 

 Fig. 1. Pterinea? suborbicularis, H. Hobbieville, Allegany county. 

 Fig. 2. Pecten duplicatus, H. Phillipsburgh, Allegany county. 

 Fig. 3. Lima rugastriata, H. Rockville, Allegany county. 

 Fig. 4. Pecten canccllatus, H. Phillipsburgh. 

 Fig. 5. Avicula? signata, H. Rockville. 

 Fig. 6. Pecten? convexus, H. Rockville. 

 Fig. 7. Pecten striatus, H. Painted-Post. 

 Fig. 8. Pecten? crenulatus, II. Rockville. 

 Fig. 9. Pecten? dolabrif or mis, H. Rockville. 

 Fig. 10. Lima glabcr, H. Phillipsburgh. 

 Fig. 11. Lima? obsoleta, H. Phillipsburgh. 



No. 61. — No. 120, page 266. 



Fig. 1. Strophomena nervosa, II. 



Fig. 1 a. An enlarged portion of the shell. Campbclltown, Steuben county. 



Fig. 2. Strophomena bifurcata, H. Napoli, Cattaraugus county. 



Fig. 3. Strophomena arctoitriata, H. Hobbieville, Allegany county. 



Fig. 4. Strophomena pectinacea. Hobbieville. 



Fig. 5 a, b, c. Strophomena inter strialis, Orthis interstrialis and Leptcena inter strialis . 

 (Phillips, Palaeozoic fossils, pages 61 and 216, pi. 25, fig. 103.) 5 a. Inner side 

 of a flat valve. Chemung. 5 a. A magnified portion of the shell. 5 b. The two 

 valves somewhat compressed. Ithaca. 5 c. The convex valve with the shell 

 partially removed. Elmira. 



No. 62. — No. 121, page 267. 

 Figs. 1 and 1 a. Orthis carinata, H. Painted-Post. 

 Fig. 2. Orthis impressa, H. Near Elmira. 

 Figs. 3 and 4. Orthis interlineata, (Sowerby in Geol. Trans. 2d series, Vol. 5, pi. 54, fig. 



14. Phillips, Palaeozoic fossils, p. 63, pi. 26, f. 106.) 

 Fig. 5. Orthis unguiculus, Atrypa unguiculus, (Sowerby in Geol. Trans. 2d series, Vol. 5, 



pi. 54, fig. 8. Spirifera unguiculus, Pal. fossils, pi. 26, f. 119.) 

 Fig. 5 a. A cast from Bald Hill, near Ithaca. 



Fig. 5 b. Lower valve, broad variety. Dexterville, Chautauque county. 

 Fig. 5 c. Upper valve. Painted-Post. 

 Fig. 5 d. Fragment of brownish sandstone, filled with casts of the shell. Jasper, Steuben 



county. 55 



