Eurypterus sp. 
Gill attached to sternite of an undetermined eurypterid, possibly 
E.maria. Shows fine anastomosing lines of the gill. x 3 
Hortzon and locality. Shawangunk grit. Otisville, N. Y. 
Strabops thacheri Beecher 
Page 152 
See plates 1,4 
Drawing of counterpart of holotype from guttapercha squeeze. Natural 
SIZe 
Horizon and locality. Potosi (Cambric) limestone. St Francois co., Mo. 
Kurypterus lacustris Harlan 
Page 173 
See plates 9-12 
Adolescent specimen, showing well the general proportion of the parts 
in approximately original position. Natural size 
Hortzon and locality. Bertie waterlime. Buffalo, N. Y. 
Eurypterus pittsfordensis Sarle 
Page 1096 
See plates 14-18 
Seventh and eighth segments of swimming leg, showing the formation 
of the slightly expanded blade, the subtriangular inner appendage 
(“guard’’) of the seventh, the incised margin of the eighth segment 
(palette) and the minute claw inserted in the same. x 24. One of 
sarle’s cotypes 
Carapace of young (adolescent) individual showing the broad frontal 
shoveling edge, the position of the lateral and median eyes and the 
posterior edge. Natural size 
Upper view of appendages of cephalothorax. Shows one chelicera on 
left frontal side, two walking legs and the coxae of the swimming 
legs. One of Sarle’s types [op. cit. pl. 10, fig. 7]; original drawing 
slightly corrected. Natural size 
Horizon and locality. Pittsford shale. Pittsford, Monroe co., N. Y. 
| The original of figure 2 is in Columbia University, the others are in the 
State Museum 
466 
