80 CATALOG OF FOSSIL FISHES IN THE MUSEUM . 



E 2394 A left mandible, somewhat larger than the preceding, lack- 

 ing the beak and the posterior extremity of the blade 

 (fig. 26,6). The greater portion of the functional area 

 is preserved, but no teeth such as are present in the 

 Ohio species are to be seen. The specimen is on shale, 

 and shown in outer view. The bone is thin and finely- 

 striated like the preceding specimen. 

 Formation and locality, same as preceding. 



In addition to these mandibles, there are several other remains of a 

 small Arthrodire which perhaps also belong to Selenosteus; the refer- 

 ence seems the more probable since they are mostly from the same 

 formation and locality as the mandibles. 



E 2395 A small cranial plate. From the thinness of the bone and 

 the occurrence of the specimen in the same formation and 

 at the same locality as the two preceding, we refer it pro- 

 visionally to Selenosteus. 

 Other data same as preceding. 



E 2396 A small dorsomedian shown in outer view, on a piece of shale 

 (fig. 26, c). The plate is relatively short and broad, 

 resembling a miniature Titanichthys dorsomedian. It 

 bears an ornamentation of small, low tubercles, which are 

 more or less fused on the median portion, but relatively 

 few and scattered on the lateral portion of the plate. 

 Length, 28 mm.; spanacrossanterior angles, 32. 



This element probably represents a small species of 

 Selenosteus. However, since the left antero-lateral angle 

 is missing, and the front margin appears somewhat 

 frayed, as if broken, we hesitate to base a species upon 

 it, since it perhaps represents a Coccosteus dorsomedian, 

 of which the anterior half has been broken away. The 

 resemblance of the element to a Selenosteus dorsomedian, 

 depends chiefly on the fact that the front margin is strongly 

 emarginate, the antero-lateral margins being produced 

 into prominent angles. The posterior extremity of the 

 plate is rather thickened and short; if it was drawn out 

 to a point, as in Coccosteus, the point has been lost. 



Other data same as preceding. 



