GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE CHEMUNG GROUP. 



No. 57. — No. 116, page 262. 

 Fig. 1. Calymene nupera, H. (Reference C. lams, Phil. Palaeozoic fossils, pi. 55, fig. 250.) 



No. 58. — No. 1 17, page 2G2. 

 Figs. 1 and 2. Avicula pectcniformis, H. Lower and upper valve. An abundant fossil of the 



Chemung group. 

 Fig. 3. Avicula longispina, II. 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 damnonicnsis, (Sowerby, in Gcol. Trans. 2d series, Vol. 5, pi. 53, 

 fig. 22. Phillips, Palaeozoic fossils, pi. 23, figs. 90, 91 and 92.) 



53 



