370 _ NEW YORK STATE MUSEUM 
Largest carapace observed: Centimeters 
Width... cece eee eee eens eee eee It. 5 
Length. 2... ccc ee eee ees —«88.8 
Length of lateraleve... 0... ec eee eee tenes 4 
Largest coxa observed: | 
Length of anterior edge............. ce ee eee eee eens 20 
Length of manducatory edge........ cece eee e ee eee eee 8.2 
Largest metastoma: 
Length. 0. ce cee ene eee e eee n nee 7 
Width... cc cc eee eee nee e eee e eens 4.2 
Largest tergite: 
Length... eee ence een eees IO 
Width about... 2. ce ee eee nnee 37) 
Largest telson: 
Length... 2. cnet eee Il.5 
Width... 2. ce ee ee cece een ene II 
The size of the largest tergite and coxa suggests that this species 
_ reached truly gigantic dimensions for merostomes and rivaled the British 
P. anglicus which Woodward [loc. cit. p. 43] felt justified in con- 
cluding “attained a length of six feet, and a breadth of nearly two 
feet, at. the widest part of its body.’’ From the relative length and width 
of the tergites in our specimens we infer that P. buffaloensis was 
more slender than the British species. The largest tergite leads us to the 
conclusion that it belonged to an individual 1.65 m or 5 feet, 5 inches 
long. The very large base from the waterlime at Buffalo[pl. 79, fig. 1] must 
by comparison of the length of its manducatory edge with that of other 
specimens, have been the formidable masticating organ of an individual 
not less than 2 m (2.01 m) or 6 feet, 7 inches long. 
The waterlime has furnished the chelae of still another gigantic euryp- 
terid, that of P. cobbi. As the relative dimensions of the chelae to 
1 Obtained at Litchfield and possibly belonging to P. macrophthalmus. 
