NEW YORK STATE MUSEUM 



3400 -^fSJ. TYPE Hall. Paleontology of New York. 1859. v - 3> 



pi. 63, fig. 8. 



Helderbergian Schoharie N. Y. 



3401 -iaf** TYPE Hall. Paleontology of New York. 1859. v. 3, 



pi. 63, fig. ga, 9b. 



Helderbergian Schoharie N. Y. 



Platyceras symmetricum Hall 



3402 J^ai TYPE Platyceras symmetricum Hall. Descrip- 



tions of new species of fossils from the Upper Helderberg, 

 Hamilton and Chemung groups. 1861. p. 6. 



Hall. Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 3, fig. 22-24. 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 

 pi. 3, fig. 22-24. 



Hamilton shales West Bloomfield, Ontario co. N. Y. 



Platyceras thetis Hall 



3403 -i&p-i TYPE Platyceras thetis Hall. Descriptions of new 



species of fossils from the Upper Helderberg, Hamilton 

 and Chemung groups. 1861. p. 4. 



Hall Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 3, fig. 13, 14. 



Hall. Paleontology of New York. 1879. v - 5> P* 2 > 

 pi. 3, fig. 13, 14. 



Hamilton shales West Bloomfield, Ontario co. N. Y. 



3404 10 | 24 TYPE Hall. Illustrations of Devonian fossils. 1876. Gas- 



teropoda, pi. 3, fig. 15. 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 



Pi- 3, % 15- 



Hamilton shales Canandaigua lake, N. Y. 



C. A. White and C. Van Deloo, coll. 1860 



3405 - L - a f J - t TYPE Hall. Illustrations of Devonian fossils. 1876. Gas- 



teropoda, pi. 3, fig. 1 6. 



Hall. Paleontology of New York. 1879. v - 5> P t 2 > 

 pi. 3, fig. 1 6. 



Hamilton shales Bellona N. Y. 



J. W. Hall and C. Van Deloo, coll. 1866 



Platyceras thetis? var. subspinosum Hall 



3406 J^ps. TYPE Platyceras thetis? var. subspinosum 



Hall. Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 3, fig. 30. 



