256 C. R. Eastman — Upper Devonian Fish Remains. 



ventrals is situated near the outer margin some distance behind 

 the middle of the plate ; in advance of this point the vascular 

 canals radiate in all directions between parallel with and at 

 right angles to the median line, but behind it they are crowded 

 together and directed obliquely backward. This condition is 

 apparent in all three individuals, and is indicated by the shad- 

 ing in fig. 1. 



The ventral armour of the best preserved individual, that 

 shown in the figure, has a width across the middle portion of 

 8'5 cir -, and an estimated total length of about 14 cm . The largest 



Fig. 3. — Bothriolepis major (Ag.). Median ventral, x \. 



example of B. canadensis with which the writer is acquainted 

 displays a corresponding width of 10 cm , and length of 16 cm . 

 B. major attains even larger dimensions, the carapace and 

 head, according to Traquair, measuring sometimes 1*5 feet. 

 The length of the pectoral appendages in the new form appear 

 to be intermediate between those of the above-named species, 

 but their covering plates are not sufficiently well preserved to 

 permit of detailed comparisons. In the drawing, the distal 

 end of one of the appendages, which is not serrated, and also 

 a portion of the left posterior ventral have been added from a 

 second specimen, otherwise the parts are shown as they occur 

 in a single individual. The outline of the median and poste- 

 rior ventrals is perfectly distinct, but the remaining sutures, 

 including those of the pectoral members, are unfortunately 

 obliterated. A very unusual feature in this genus is the 

 obtusely rounded posterior margin of the plastron. On the 

 whole, it appears probable that the relations of the Colorado 



