TYPE SPECIMENS OF PALEOZOIC FOSSILS 569 



Hyolithus impar Ford 

 35°7 1X ? 24 type Hyolithes impar Ford. American journal of 

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



Walcott. United States geological survey bulletin 30. 

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



Walcott. 10th annual report of the United States geo- 

 logical survey. 1890. pi. 77, fig. 1, ia, ic. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 

 3508 J^JiA type Ford. American journal of science and arts, ser. 3. 

 1872. 3:419, fig. 2b. 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 

 35°9 — F- ?type 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 



35 I0 ^^T— type Theca ligea Hall. Descriptions of new species 

 of fossils from the Upper Helderberg, Hamilton and Che- 

 mung groups. 1 86 1. p. 34. 



Hyolithes ligea Hall. Paleontology of New 

 York. 1879. v - 5' Pt 2, pi. 32, fig. 15. 



Schoharie grit Schoharie N. Y. 



Lgu nip. TYPE? HaU Paleontology of New York. 1879. v. 5, 

 pt 2, pi. 32, fig. 16. 



Schoharie grit Schoharie N. Y. 



J. Oebhard purchase 

 Hyolithus principalis Hall 

 3512 -LLp^ type: plastotype Hyolithes principalis 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 



35'3 "? ? - type: hvpotype Hall. Paleontology of New York . 1879. 

 v. 5, pt 2, pi. 32, fig. 2,. 



Schoharie grit Schoharie N. \. 



