7O NEW YORK STATE MUSEUM 



(3) 1847 Hall, James. Palaeontology of New York. v. i. 



(4) 1858 Billings, E. On the Asteridae of the Lower Silurian Rocks 



of Canada. Can. Org. Remains. Dec. Ill, p. 75. 



(5) 1865 Billings, E. Geology of Canada, Palaeozoic Fossils, v. I. 



(6) 1873 Meek, F. B. Descriptions of Invertebrate Fossils of the 



Silurian and Devonian Systems. Rep't, Geol. Surv. Ohio, 

 v. .1, pt 2. 



(7) 1877 Whitfield, R. P. In Lieut. G. M. Wheeler's Report on U. S. 



Geog. Surv. West of looth Meridian, v. 4, Pal., p. 19-20 



(8) 1879 Ulrich, E. O. Descriptions of New Genera and Species of 



Fossils from the Lower Silurian about Cincinnati. Jour. 

 Cincinnati Soc. Nat. Hist. v. 2. 



(9) Walcott, C. D. The Utica. Slate and Related Formations of 



the Same Geological Horizon. Albany Inst. Trans. 10. 1-17. 

 (10) Walcott, C. D. Fossils of the Utica Slate. Albany Inst. 



Trans. 10:18. 

 (n) 1882 Miller, S. A. Description of Two New Genera and Eight 



New Species of Fossils from the Hudson River Group, with 



Remarks upon Others. Jour. Cincinnati Soc. Nat. Hist. 



5:34. 



(12) Whitfield, R. P. Geology of Wisconsin, v. 4, Paleontology. 



(13) 1883 Beecher, C. E. List of Species of Fossils from an Exposure 



of the Utica Slate and Associated Rocks within the Limits 

 of the City of Albany. 36th Annual Report N. Y. State 

 Mus. Nat. Hist. p. 78. 



(14) 188,5 Ford, S. W. Age of the Slaty, and Arenaceous Rocks in the 



Vicinity of Schenectady, N. Y. Amer. Jour. Sci. 29:397-99. 



(15) 1889 Ulrich, E. O. Contribution to Canadian Micro-Paleontology, 



pt II. 



(16) 1890 Stiirtz, B. Bietrage zur Kenntniss palaeozoischer Seesterne. 



Palaeontographica. 36:234. 



(17) Walcott, C. D.. Value of the Term "Hudson River Group" 



in Geologic Nomenclature. Bui. Geol. Soc. Amer. 



i:335-57. 



(18) Hall, James, & Clarke, J. M. Palaeontology of New York. 



v. 8, pt. i. 



(19) 1893 Beecher, C. E. On the Thoracic Legs of Triarthrus. Amer. 



Jour. Sci., Ser. 3, v. 46, 1893; also Amer. Geol., v. 13, 1894; 

 Amer. Jour. Sci., Ser. 3, v. 47, 1894; Amer. Geol., v. 15, 1895; 

 Amer. Jour. Sci., Ser. 4, v. i, 1896. 



(20) Clarke, J. M. The Protoconch of Orthoceras. Amer. Geol. 



12:112. 



(21) Matthew, W. D. On Antennae and Other Appendages of Tri- 



arthrus becki. Amer. Jour. Sci., Ser. 3, v. 46. 



(22) Ulrich, E. O. New and Little Known Lamellibranchiata from 



the Lower Siluric Rocks of Ohio and Adjacent States. 

 Rep't, Geol. Sur. Ohio. v. 7. 



(23) 1894 Clarke, J. M. The Early Stages of Bactrites. Amer. Geol. 



14:37. 



