Description of Plate III. 



Psammost&us arcticus KI.KR new species, Upper Devonian (E), Skrap Valley. 



Ellesmere Land. Page 23. 



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

 Fig. 2. The sain.'. < (>. Pal. Mns. 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 Gemundenensis SC.HU"T , Lower Devonian, Gemi'uulen, Germany. 



Pal. Mns. Krist. Univ. Page 29. 



Fig. 5. Longitudinal microscop. section of body plate. X 2.". 

 F^ig. 6. Microscop. section of denticle. X 85 



