120 



Description of Plate IV. 



Strenuella primaeva Brøgger. Page 31. 

 Fig. 1 (X 3). Almost complete cranidium 3.8 mm. long, seen from above. 



Calcareous sandstone bed in Holmia shales, Tomten. Krist. 



Univ. Pal. Mus. Cat. B. K. No. x. 

 Fig. la ( 5.5). Same specimen, profile from side. 

 Fig. lb ( • 5.5). Same specimen, profile from front. 

 Fig. 2 ( ' 3). Somewhat incomplete cranidium 4.5 mm. long. Calcareous 



sandstone bed in Holmia shales. Tomten. Krist. Univ. 



Pal. Mus. Cat. No. 15. 111. 1. 

 Fig. 3 ( . 1.6). Almost complete cranidium 10.7 mm. long, seen from 



above. Holmia shales. Tomten. Krist. Univ. Pal. Mus. 



Cat. No. 13. XXVII. 835. 

 Fig. 3a ( - 1.6). Same specimen, profile from side. 

 Fig. 3b(>< 1.6). Same specimen, profile from front. 

 Fig. 4 (>< 1.5) Almost complete cranidium 8 mm. long, seen from above. 



Holmia shales. Tomten. Krist. Univ. Pal. Mus. Cat. No. 13. 



XXVII. 909. 



Strenuella Linnarssoni nov. sp. Page 38. 

 Fig. 5 ( 1.6). Almost complete cranidium 12.2 mm. long, seen from above. 



Calcareous sandstone bed, Strenuella Lmst., Tomten. Krist. 



Univ. Pal. Mus. Cat. B. K. No. 65. 

 Fig. 5a (x 1.6). Same specimen, profile from side. 

 Fig. 5b(> 1.6). Same specimen, profile from above. 

 Fig. 6 (x 1.6). Anterior portion of cranidium, seen from above. Calcareous 



sandstone bed, Strenuella Lmst., Tomten. Krist. Univ. Pal. 



Mus. Cat. A. K. No. 189. 



Ellipsocephalus Nordenskjøldi Lnrs. Page 41. 

 Fig. 7 (- 1.5). Almost complete cranidium 10.2 mm. long, seen from 



above. Calcareous sandstone bed, Strenuella Lmst., Tomten. 



Krist. Univ. Pal. Mus. Cat. A. K. No. 175. 

 Fig. 7a ( 1.5). Same specimen, profile from side. 

 Fig. 7b ( • 1.5). Same specimen, profile from front. 

 Fig. 8 ( 2.2). Almost complete cranidium 12.5 mm. long, which however 



is greatly pressed obliquely. Seen from above. Holmia 



shales. Tomten. Krist. Univ. Pal. Mus. Cat. No. 13. 



XXVII. 16. 



