TYPE SPECIMENS OF PALEOZOIC FOSSILS 569 



Hyolithus impar Ford 



357 :LL $ S TYPE Hyolithes impar Ford. American journal of 

 science and arts, ser. 3. 1872. 3:419, fig. la, ib, 2a. 



Walcott. United States geological survey bulletin 30. 

 1886. pi. 14, fig. i, la, ic, 



Walcott. loth annual report of the United States geo- 

 logical survey. 1890. pi. 77, fig. i, la, ic. 



Lower Cambric Troy N. Y, 



S. W. Ford purchase 



3508 --| 2 - TYPE Ford. American journal of science and arts, ser. 3. 



1872. 3:419, fig. 2b. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



3509 ii-^ PTYPE Ford. American journal of science and arts, ser. 3. 



1872. 3 : 419 (operculum, not figured). 

 Lower Cambric Troy N. Y. 



S. W. Ford purchase 

 Hyolithus ligea Hall 



3510 ^o 25 TYPE Theca ligea Hall. Descriptions of new species 



of fossils from the Upper Helderberg, Hamilton and Che- 

 mung groups. 1861. p. 34. 



Hyolithes ligea Hall. Paleontology of N ew 

 York. 1879. v. 5, pt 2, pi. 32, fig. 15. 



Schoharie grit Schoharie N. Y. 



3511 lif^- TYPE? Hall. Paleontology of New York. 1879. v. 5, 



pt 2, pi. 32, fig. 16. 



Schoharie grit Schoharie N. Y. 



J. Gebhard purchase 



Hyolithus principalis Hall 



3512 J^p-^ TYPE: PLASTOTYPE Hyolithes principal is Hall. 



Illustrations of Devonian fossils. 1876. Pteropoda, pi. 27, 

 fig. 20. 



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

 p. 196, pi. 32, fig. 20. 



Schoharie grit Schoharie N. Y. 



J. Gebhard purchase 

 35 J 3 -- TYPE: HYPOTYPE Hall. Paleontology of New York. 1879. 



V. 5, pt 2, pi. 32, fig. 2f. 



Schoharie grit Schoharie N. Y. 



