62 



Description of Plate III. 



Psammosteus arcticus KJ.R new species, Upper Devonian (E), Skrap Valley. 



Ellesmere Land. Page 23. 



Fig. 1. Portion of plate (= PI. II, fig. 5). X 4. S. 1. 20. Pal. Mus. Krist. Univ. 

 Fig. 2. The sain.-. X 6. Pal. Mus. Krisl. Univ. 



Fig. 3. Transversal microscopical section of the latter portion, X 27. 

 Fig. 4. Microscop. section of a fragment (= PI. II, fig. 6). X 40. 



Drepanaspis Getnundenensis SC.HLUT, Lower Devonian, GemOiulen, Germany 



Pal. Mus. Krist. Univ. Page 29. 



Fig. 5. Longitudinal microscop. section of hody plate. X 2~>. 

 Fig. 6. Microscop. section of denticle. X 85 



