356 NEW YORK STATE MUSEUM 
nected in the same specimen, our larger collection of individuals in various 
growth stages and states of preservation leaves no doubt that the types 
of both belong to one species, which must be named P. macrophthal- 
mus, as the latter precedes the other in the original descriptions and is 
better characterized by being based on a carapace. Professor Whitfield’s 
accurate drawings show all essential features of the type specimens of 
P. macrophthalmus. We may add that Hall’s figure 6, plate 
80A, which is described as ‘‘a fragment of a crustacean associated with 
the E. remipes at Waterville, the relations of which have not been 
determined” is the broken fixed ramus of the pincers from a young 
individual of P. macrophthalmus. 
Pterygotus macrophthalmus is quite distinct in its 
characters from all the European species. It is closely related to 
P. anglicus, in the similar form of the telson, but it is readily 
distinguished from the British type by characters of its own. One of 
these is the fishhooklike form of the extremities of the chelae and 
the different direction of their teeth. These features, at least the form of 
the distal ends of the chelae, are approached by P. osiliensis, 
a species with widely different telson. 
Pterygotus atlanticus nov. 
Plate 79, figures 3-5 
Pterygotus sp. Whiteaves. Canadian Naturalist. 1883. 10: 100 
Remains of Pterygotus recorded from several Devonic horizons of 
eastern Canada have been briefly referred to on a previous page. 
Billings, in Logan’s Geology of Canada, cited their occurrence at Cape 
Bon Ami, Gaspé; the single specimen, however, proves to be not from 
the Bon Ami beds, but from the higher or Grande Gréve limestone of the 
Lower Devonic. This specimen is a fragment of two abdominal segments, 
together having a length of 75 mm and covered with closely crowded, 
very coarse scales curved into the arc of a circle. It indicates a species 
of rather commanding dimensions. Sir William Logan also reported the 
