GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE CHEMUNG GROUP. 
No. 57. — No. 116, page 262. 
Fig. 1 . Calymene nupera, H. (Reference C. Icevis, Phil. Palaeozoic fossils, pi. 55, fig. 250.) 
No. 58. — No. 117, page 262. 
Figs. 1 and 2. Avicula pecteniformis, H. Lower and upper valve. An abundant fossil of the 
Chemung group. 
Fig. 3. Avicula longispina, H. Painted-Post. 
Fig. 4. Avicula spinigera, Conrad (Jour. Acad. Nat. Sci. Vol. 8, p. 237, pi. 12, fig. 3.) 
Painted-Post. 
No. 59. — No. 118, page 263. 
Fig. 1 a and b. Avicula damnoniensis, (Sowerby, in Geol. Trans. 2d series, Vol. 5, pi. 53, 
fig. 22. Phillips, Palaeozoic fossils, pi. 23, figs. 90, 91 and 92.) 
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