1898-1902. No. 33.] UPPER DEVONIAN FISH REMAINS. 15 



In M. Scheii the head shield is more elongated, and therefore the 

 snout portion was in all probability longer, the orbits much larger and 

 more elongated, and the infra-orbital canal less sharply inclined at 

 an angle. 



As we have seen the new form differs markedly from M. raphei- 

 dolabis and priimiensis by its different supra-orbital angle. The form 

 of the head-shield too is so different, lhat it is impossible to confuse 

 the two. 



As mentioned in my description, there are two other peculiarities 

 deserving of attention, viz. the hindermost branches and the pores of 

 the sensory canals. 



As regards the former we should wait until the existence of any 

 corresponding structure in the other forms has been investigated, before 

 we attribute any considerable systematic importance to them. With 

 reference to the pores, double rows of poies are regarded as a mark of 

 the genus Macropetalichthys 1 . Therefore the single row of pores in 

 M. Scheii must be considered to be an important character of this form. 

 Several of the other species, however, are so little known that other 

 species, - - e. g. M. Ayassizi v. MEYER and M. pelmensis HENNIG, - 

 may also possibly possess the same peculiarity. 



We thus obtain as our main result that M. Scheii approaches 

 most closely to M. Agassizi v. MEYER from the Middle Devonian at Eifel, 

 but that the former is quite distinct from the latter. 



Stratigraphical Results of Series D. 



Macropetalichthys Scheii new species described here is the only 

 fish fossil that I have been able to describe from series D, e. g. from 

 the zone Dh. 



0. E. MEYER, who recently described the brachiopodes from the 

 same series, says concerning the zones Dh i: 



"The two strata marked Dh and Di in the field show a remarkable 

 conformity with the American Chemung group. This conformity is 

 seen not only in the great similarity of the faunas, but also in the 

 astonishing likeness of the rocks to each other". 



Moreover from other remarks it appears that 0. E. MEYER places 

 these two zones parallel with Chemung, that is with the upper 

 part of the Upper Devonian. 



1 GOODRICH, Cyclostomes and Fishes, Page 



