have afforded, fragmentary remains indicate the presence of several other representatives of the same genus, which for the sake of completeness, may be mentioned in this place.
α. Plate 53, figures 8, 10–12. One of these is characterized by its acutely triangular scales, which assume the aspect of short sharp spines and actually seem to have consisted of such in the specimen, figure 10, where the fact that the distal parts of the scales are always broken off, is evidence of their spinose nature. The fragments of segments indicate that these possessed distinct anterior and posterior borders. A single segment of one of the first or second pairs of legs has been obtained. This by its lateral row of spines permits a reference of the species to the subgenus Ctenopterus.
β. Plate 53, figures 14, 15. A second species, quite probably also referable to Ctenopterus, is best represented by the leg segment reproduced in figure 15. This shows a series of teethlike serrations, quite dissimilar to the rows of spines in other species.
γ. Plate 53, figure 19. A third leg segment, also possessing the characteristics of Ctenopterus, shows broad, flat (paired?) spines with longitudinal striae; these features strongly reminding one of the leg spines of S. excelsior.
δ. Plate 53, figures 6, 9. Some patches of integument bear a sculpturing which consists of flat, broad, distinctly separated prominences and in part of long ridges, the whole resembling a cobblestone pavement. This is so strikingly different from all other ornamentation observed in the beds at Otisville, that it can not fail to characterize its possessor. It is more suggestive of the ornamentation exhibited by such forms as S. excelsior, scoticus and myops than of members of other genera.
Some other specifically indeterminable fragments deserving mention, may be noted here. One of these is the distal portion of one of the posterior legs [pl. 53, fig. 20] of a Stylonurus, chiefly remarkable for its size, indicating the presence of large individuals of the genus in this Otisville fauna. Another
