GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE NIAGARA GROUP. 



No. 10. — No. 33, page 101. 

 Fig. 1. Asaphus limulurus, Green (Monograph, p. 48). Resembles and is perhaps identical 



with the A. longicaudatus of Murchison, and holds the same place in the series. 



Lockport. 

 Fig. 2. Head of A. limulurus. This portion of the fossil is abundant at Rochester. 

 Fig. 3. Calymene Niagarensis, H. Abundant at Lockport. Closely resembles in many 



respects the Cahjmcne scnaria of the Trenton limestone. 

 Fig. 4. Bwnastis barriensis, (Silurian Researches, p. G56, pi. 7 bis, fig. 3, a, b, c and d ; pi. 



14, fig. 7, a and b.) The specimen figured is nearly twice the usual size, though 



there is one in the State collection one-third larger than the figure. Lockport. 



No. 11. — No. 31, page 103. 

 Jlomalonotus delphinocephalus . (Silurian Researches, pi. 7 bis, fig. 1 a, 1 b.) Trimerus 

 delplxinoccplialus, Green {Monograph, fig. 1, p. 82). This trilobite often attains 

 the length of seven or eight inches, and very rarely twelve inches. Lockport. 



