.26 PALAEONTOLOGY OF NEW YORK. 



the limestone near the top of these shales abundant, at LeRoy and Stafford, 

 Genesee county ; Flint Creek, town of Seneca, Ontario county: in the Hamil- 

 ton shales everywhere; the most prolific localities being in the western coun- 

 ties; Tichenor's and Menteth's Points, Canandaigua Lake ; Centerfield, Hope- 

 well and Flint 'reek. Ontario county; shores of Seneca and Cayuga Lakes; 

 Moscow and York, Livingston county; Darien and Pavilion, Genesee count v ; 

 Hamburgh and Eighteen-mile Creek, Erie county : in the Tully limestone at 

 Moravia, Seneca county; Bellona, Yates county; near Borodino, Onondaga 

 county. Also in the Hamilton formation at Charlestown, Indiana; " Bake- 

 Oven," Jackson county, Illinois; Iowa City, Solon, Roberts' Ferry, Johnson 

 county ; Independence, Buchanan county, and New Buffalo, Scott county, Iowa;* 

 Washington Street Bridge and Whitefish Bay, near Milwaukee, Wisconsin; 

 Cumberland, Maryland ; (?) Comb's Peak and Lone Mountain, Nevada; Wid- 

 der and Arkona, Province of Ontario. 



Phacops bufo. 



PLATE VIII, FItiS. 25, J6. 



Cahjmtu< bufo, Green. Monogr. Trilob. North America, p. 41. 1832. 

 Phacops bufo, Hall. Descr. New Species of Fossils, etc., p. 65. 1861. 

 Phacops bufo. Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist., p. 03. 1862. 

 Phacops bufo, Hall. Illustrations of Devonian Fossils, pi. viii, figs. 24, 25. 1876. 



The type specimen of Dr. Green's species is an imperfect cast of the lower 

 surface, and is said to have been found in a dark grayish limestone in the State 

 of New Jersey. Its geological horizon was not definitely stated by its author, 

 but is undoubtedly of the age of the Upper Helderberg or Hamilton group. 

 The original example of the species presents a general agreement with Phacops 

 rana (Calymcne bufo, var. ram, Green), of the Hamilton group, but appears to be 

 somewhat more elongate, with a proportionally longer and more tumid 

 glabella. Specimens from New York State agreeing with the type have not 

 been observed. 



localities in Iowa have beer kindly < municated by Professor Samuel Calvin. 



