121 Bulletin 13 



ports, by the name Fucoidal layers." It is to this division of 

 A''anuxem that C. S. Prosser^ refers the Calciferous of our sec- 

 tion. In writing of this layer Vanuxeni further says: "Besides 

 fucoids it contains other fossils, many of which are peculiar to 

 the rock; they appear to be more numerous where the birdseye 

 mixture exists." The wood cut which follows "exhibits four 

 of the most characteristic fossils of the group," viz: i, Ophilcta 

 Icvata; 2, O. compIa)iata; 3, a crinoid plate; 4, Orthoceras pri- 

 migenium. 



James Hallt was of the opinion that "from the nature of the 

 rock, and from the condition of many of its fossils, we cannot 

 doubt but many more forms, both of plants and animals, were 

 imbedded in it than we find at the present time." In the same 

 volume twelve species are figured, of which four are from loose 

 boulders or doubtful localities. 



In 1879+ C. D. Walcott described six species, without fig- 

 ures, from Saratoga Co. 



Between 18S1-91 J. M. Whitfield || figured and described a 

 large number of fossils, collec^ted by Brainard and Seely, from 

 the Calciferous of Lake Champlain. 



Prof. W. B.. Dwight* of Vassar in 1884 described eight new 

 spacies from the Calciferous of Wappinger \'allev at Rockdale, 

 N. Y. 



In his report on the "Lower Silurian Sections, "S C. S. 

 Prosser makes no mention of fossils, although he describes the 

 quarry- and railroad cut from wdiich our fauna was obtained. Up 

 to the present time the number of species from the Calciferous of 

 the Mohawk Valley has not been materially increased since the 

 publication of Vol. i. Pal. N. Y. 



In this paper twenty-two species are described from this 

 stage, of which one genus, 15 species and one variety are figured 

 and described for the first time. 



"•'Rept. of the State Geol. N. Y., vol. i, 1S95. Sections and thickness 

 of the Lower Silurian Formations on West Canada Creek and in the Mohawk 

 \'alle}-, p. 646. 



tPal. N. Y., vol. I, p. 5, 1847. 



JN. Y. vState Mus. Nat. His. Rept. 32. 



II Am. Mus. Nat, His. Bull., vols, i, 2, 3. 



<! Prosser, Rept. Geol. N. Y., vol. I, 1895. 



'.\m. Jour. Sci., 3rd .series, vol. 27, pp. 249, 259. 



