THE STATE GEOLOGIST. 85 



Fig. 12. 

 Semionotus fultus Ag. Fulcra and anterior rays of dorsal fin 



As already remarked, the sole criterion relied upon by New- 

 berry for distinguishing the so-called S. meter opt erus consisted in 

 a supposed relatively greater depth of body — "the fusiform and 

 slender fish standing for /. fultus, and the broader one for /. 

 macropterus." Curiously enough, it has been shown by Dr. 

 Eaton, after a study of Newberry's originals in the American 

 Museum of Natural History, that whereas one of the specimens 

 of S. macropterus in its compressed and flattened condition is 

 deeper than a type of S. fultus, all the others are proportionately 

 more slender. 1 J. H. Redfield, after advocating the suppression 

 of the name "macropterus," remarks that S. fultus is specially 

 characterized by the length of the dorsal and anal fins, which 

 are even longer than in S. tenuiceps. 2 A comparison of text Fig- 

 ures 12 and 13 will enable one to appreciate the differences as 

 regards structure of the dorsal fin in this species and S. microp- 

 terus. In Plate IX. of this report is given a photographic repro- 

 duction of one of Newberry's originals. 



This is the most abundant of all the New Jersey species, and in 

 the Connecticut Valley Trias is only inferior numerically to the 

 ubiquitous S. tenuiceps. The average length is stated by New- 



1 Amer. Journ. Sci. [4], vol. xv., p. 262. 



*Cit.j Newberry, Monogr. U. S. Geol. Surv., vol. xiv. (1888), p. 35. 



