TYPE SPECIMENS OF PALEOZOIC FOSSILS 



569 



Hyoiithus impar Ford 



3507 1 1 1 24 type H y o 1 i t h e s 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. 1, 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 — f- A type Ford. American journal of science and arts, ser. 3. 



1872. 3:419* fi g- 2b - 



Lower Cambric Troy N. Y. 



S. W. Ford purchase 



3509 — ? 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 



Hyoiithus ligea Hall 



3510 1 1 J 25 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- 3 2 > fi g- 



Schoharie grit Schoharie N. Y. 



35 1 1 11 g 25 type? Hall. Paleontology of New York. 1879. v. 5, 



pt 2, pi. 32, fig. 16. 



Schoharie grit Schoharie N. Y. 



J. Gebhard purchase 



Hyoiithus principalis Hall 



3512 n; 26 type: plastotype Hyolithes principalis Hall. 



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

 fig. 20. 



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

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



Schoharie grit Schoharie N. Y. 



J. Gebhard purchase 



35!3 — 2— type: hypotype Hall. Paleontology of New York. 1879. 



V. 5, pt 2, pi. 32, fig. 21. 



Schoharie grit Schoharie N. Y. 



