DEVONIAN FISHES OF IOWA 



259 



cately striated, lower border of maxilla with long anterior pro- 

 jection. Scales of flank somewhat broader than deep, not much 

 overlapping, ornamented with from five to seven oblique or 

 sometimes sigmoidally flexed striae which terminate at the 

 posterior border in a corresponding number of sharp serrations. 

 A series of greatly enlarged ridge-scales extending to the base 

 of the caudal fin, pointed posteriorly, ornamented with wavy 

 striae, and presenting a punctate appearance in the worn or 

 weathered condition. Some of the ridge-scales behind the dorsal 

 fin have a length of about 5 mm and breadth of 3.5 mm. Fins 

 imperfectly preserved in all specimens thus far examined. Ful- 

 cra along dorsal lobe of the caudal moderate. 



The original description of this species is accompanied by 

 figures of worn flank-scales which do not show the posterior 



Fig. 38. 



Fig. 38. Rhadinichthys devonicus (Clarke.) Naples shale (Portage beds); Sparta, NewYork. 

 Holotype, now the property of the United States National Museum at Washington. x 1-1. 



