Eurypterus lacustris Harlan 
Page 173 
See plates 10-13 
I Specimen retaining approximately natural proportions. Interior view 
of dorsal side except the telson which is seen from the ventral side. 
Postabdomen stretched and showing connecting membranes 
Horizon and locality. Bertie waterlime. Williamsville, Erie co., N. Y. 
Photograph. Original in the museum of the Buffalo Society of Natural 
Sciences 
458 
