166 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



Onondaga limestone, (Mid. Devonic); Park Quarry, 

 Buffalo, New York. Collected by Mr. F. K. Mixer. 



E 1848 Distal half of a spine (PL 53, fig. 2). Length, as far as pre- 

 served, 95 mm.; greatest width, 21. This is the speci- 

 men referred to above as showing the opposite side to 

 that already known in Machcer acanthus. As will be seen 

 from the figure, the median ridge, instead of extending 

 to the point of the spine, terminates about 2 cm. from 

 the extremity, at which point the ridge and the lateral alas 

 merge into a smooth, rounded surface. As this ridge is 

 not sharp-angled, but broad and rounded, it is obviously 

 the ridge on the opposite side to the one usually figured; 

 and so gives for the first time information as to the form 

 of the distal extremity of this side of the spine. 



Onondaga limestone (Mid. Devonic); Cemetery 

 Quarry, Buffalo, New York. Piper collection. 



E 1849 Distal half of a spine. Length, as far as preserved, 92 mm.; 



width (at 55 mm. from apex), 21. This specimen agrees 



well with typical spines of this species. (PL 53, fig. i.) 



Onondaga Hmestone; Cemetery Quarry, Buffalo, New 



York. Collected by Mr. F. K. Mixer. 



Machaeracanthus longaevus Eastman 



Machar acanthus longavus Eastman, New York State Mus., Mem. x, 85, plate ii, 

 fig. 8, 1907. 



E 1874 Type. — Right and left pectoral fin-spines of one fish, im- 

 perfectly preserved; in counterpart. 



Lower Hamilton (so-called "Trilobite bed"); shore of Lake Erie, 

 near mouth of Eighteen Mile Creek, N. Y. 



The original description of the specimen by Eastman,^® may here 

 be quoted. 



The present example is interesting in that it is one of the few in which spines 

 of both pectoral fins are preserved in natural association. That this is the case, 

 instead of there being merely a single, large broken spine, is evident from the 

 similar proportions and general appearance of the two spines, one of which clearly 

 represents the proximal and middle portions, and the other a section extending 



'8 Devonic fishes of the New York formations. N. Y. Slate Mus., Mem. x. S5-86, 1907. 



