Eurypterus lacustris Harlan var. pachychirus Hall 
Page 179 
See plate 12 
1 A right swimming leg; original of Hall’s type [Palaeontology of N. Y. 
Vv. 3, pl. 82, fig. 3], showing the great width of the seventh joint. Natural 
size 
Eurypterus dekayi Hall 
Page 181 
See plate 20, figure 1 
2 Nearly entire specimen, exposing the ventral view of the abdomen and 
the interior view of the carapace. The posterior portion of the pre- 
abdomen is contracted. The specimen shows the broad carapace, 
the great number of long spines on each segment of the walking leg, 
the form of the swimming leg and the long postlateral lobes of the 
last segment. Natural size 
The figures are from photographs. Originals are from the Bertie water- 
lime, Buffalo, N. Y.; that of figure 1 is in the State Museum, of figure 2 
in the museum of the Buffalo Society of Natural Sciences 
478 
