GEOLOGY OF THE FOURTH DISTRICT. 
ORGANIC REMAINS OF THE NIAGARA GROUP. 
No. 10. — No. 33, page 101. 
Fig. 1 . Asciphus 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. Flead 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 Calymene senaria of the Trenton limestone. 
Fig. 4. Bumastis barriensis , (Silurian Researches, p. 656, 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. 34, page 103. 
Homalonotus delphinocephalus. (Silurian Researches, pi. 7 bis, fig. 1 «, 1 J.) Trimerus 
delphinocephalus, Green ( Monograph , fig. 1, p. 82). This trilobite often attains 
the length of seven or eight inches, and very rarely twelve inches. Lockport. 
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