THE STATE GEOLOGIST. 83 



Semionotus gigas (Newberry). 



Ischypterus gigas, J. S. Newberry, Trans. N. Y. Acad. Sci., vol. vi., p. 

 127 (name only). 

 1888. Ischypterus gigas, J. S. Newberry, Monogr. U. S. Geol. Sun-., vol. xiv., 

 p. 49, pi. xiv., Fig. 3. 



This species is founded upon the fragmentary caudal portion of 

 a large example of Semionotus from the Newark series at 

 Boonton, the total length of the fish being estimated by Newberry 

 to have been about two feet. It is quite possible that the type 

 specimen was simply a large-sized individual of S. agassizii, but in 

 the absence of all other material the name may be allowed to' stand 

 in a provisional sense as indicating a form not clearly distinguish- 

 able from the preceding. 



Semionotus fultus (Agassiz). 



(Plate II., Figs. 1-4; Plate IX.) 



1833-36. Palceoniscus fultus, L,. Agassiz, Poiss. Foss., vol. ii., pt. i., pp. 4, 43, 



pi. viii., Figs. 4, 5. 

 1841. Palceoniscus fultus, W. C. Redfield, Amer. Journ. Sci., vol. xli., p. 25. 

 1841. Palceoniscus macropterus, W. C. Redfield, ibid., p. 25. 

 1847. Ischypterus fultus, Sir P. Egerton, Quart. Journ. Geol. Soc, vol. iii., 



p. 277. 

 1850. Ischypterus fultus, Sir P. Egerton, ibid., vol. vi., pp. 8, 10. 

 1877. Ischypterus fultus, R. H. Traquair, ibid., vol. xxxiii., p. 559. 

 1888. Ischypterus fultus, J. S. Newberry, Monogr. U. S. Geol. Surv., vol. xiv., 



p. 34, pi. vi., Fig. 2; pi. vii., Fig. 1. 

 1888. Ischypterus macropterus, J. S. Newberry, ibid., p. 41, pi. xii., Fig. I. 

 1901. Semionotus tenuiceps, W. H. Hobbs, 21st Ann. Rept. U. S. Geol. Surv., 



pt. iii., p. 56, pi. iii., Fig. A (err ore)} 

 1901. Semionotus fultus, E. Schellwien, Phys.-okon. Gesellsch. Konigsberg, 



p. 29, pi. iii., Figs. 4 (?), 5. 

 1903. Semionotus fultus, G. F. Eaton, Amer. Journ. Sci. [4], vol. xv., p. 261, 



pi. v., Figs. 1-4. 

 1895. Semionotus fultus, A. S. Woodward, Cat. Foss. Fishes Brit Mus., pt.. 



iii., p. 58. 



The synonymy given above is that generally concurred in by- 

 recent writers. The two species, S. fultus and S. macropterus,,, 



1 The present writer is not responsible for this determination. The original 

 of Fig. B was referred by him to S. fultus, that of Fig. A to Catopterus. 



