124 



Description of Plate VI. 



Holmia Kjerulfi Lnrs. Page 58. 

 Fig. 1 ( < 1.4). Protaspis-stage. Cranidium 1.5 mm. long. Lowest to right 



in natural size. Holmia shales, Tomten. Krist. Univ. Pal. 



Mus. Cat. B. K. No. 26. 

 Fig. 2 ( 4). Cranidium, 2 mm. long. Early Nepionic-stage. Holmia 



shales, Kletten. Krist. Univ. Pal. Mus. Cat. A.K. No. 152a. 

 Fig. 3 (4). % Cranidium, 3.7 mm. long. Later Nepionic-stage. Holmia 



shales. Kletten. Krist. Univ. Pal. Mus. Cat. A. K. No. 152. 

 Fig. 4 ( 1.3). Cranidium, 4.5 mm. long. Holmia shales, Tømten. Krist. 



Univ. Pal. Mus. Cat. A. K. No. 15. 

 Fig. 5. (Nat. size). Cranidium, 9 mm. long. Holmia shales, Tomten. Krist. 



Univ. Pal. Mus. Cat. No. 13. XXVII. 55. 

 Fig. 6. (Nat. size). Cranidium, 13.5 mm. long. Holmia shales, Tømten. Krist. 



Univ. Pal. Mus. Cat. A. K. No. 14. 

 Fig. 7. (Nat. size). Cranidium, 15.5 mm. long. Left eye preserved. Holmia 



shales, Tømten. Krist. Univ. Pal. Mus. Cat.No. 13. XXVII. 



752. 

 Fig. 8. (Nat. size). Cranidium, 16 mm. long, with both eyes preserved. Krist. 



Univ. Pal. Mus. Cat. A. K. No. 12a. 

 Fig. 9. (Nat. size). 3 cranida, of which one (lowest to left) shows part of 



hypostome, hypostome attachment, and doublure. Holmia 



shales, Tømten. Krist. Univ. Pal. Mus. Cat. B. K. No. 21. 

 Fig. lO.(Nat.size). Somewhat incomplete cranidium, 25 mm. long. Holmia shales, 



Tømten. Krist. Univ. Pal. Mus. Cat. B. K. No. 79. 

 Fig. 11. (Nat.size). Highly compressed cranidium, about 30 mm. long. Holmia 



shales, Tømten. Krist. Univ. Pal. Mus. Cat. A. K. No. 156. 

 Fig. s 1 — 11. show some of the changes that the cranidium of Holmia 



Kjemlfl Lnrs. undergoes during its development and growth. 



Fig. 1 Protaspis stage; fig.s 2 — 3 Nepionic stages; fig. s 



4 — 5 neanic stages; 6 — 11 ephebic stages. 



Holmia grandis nov. sp. Page 70. 

 Fig. 12. (Nat.size). Cranidium, highly compressed and incomplete. Holmia shales 

 Tømten. Krist. Univ. Pal. Mus. Cat. A. K. No. 114. 



