= 
COomT ON 
Pterygotus macrophthalmus Hall 
Page 350 
See plate 69, fig. 2-7; plate 71 
Ventral view of a nearly entire specimen showing the operculum with 
female genital appendage and the other sternites, a swimming leg, 
a detached distal portion of a chelicera and the long, club-shaped 
basal joint of another 
Well preserved telson of a larger individual showing the elongate form. 
Natural size 
Horizon and locality. Cranes Corners, Herkimer co., N. Y. 
Pterygotus monroensis Sarle 
Page 380 
Fragment of free pincer or chela probably belonging to this species. 
Natural size | 
Metastoma, probably belonging to this species. Natural size 
The type. Carapace. Natural size 
Horizon and locality. Pittsford, Monroe co., N. Y. 
Pterygotus? sp. 
Fragment of carapace, probably belonging to Pterygotus. Natural size 
Distorted carapace of a Dolichopterus or Pterygotus. Natural size 
Telson of a Pterygotus. Natural size 
Horizon and locality. McKenzie formation (Basal Cayugan period of 
Upper Siluric). Near Hancock, Md. 
The originals of figures 1-5 are in the State Museum, those of figures 
6-8 in the National Museum 
