PLATE IX. 



Fig-. 3(i. Chromyeehiniis horeaUs (Cl.), ^'"^/i. The outer shell is only indicated by the transverse processus of the I'adial sjiines. Larger 

 spines on one side of the shell. Kvænangen, "Vi 1899. 



a. The 3rd shell, with spines. 



b. Optical section, showing- the three shells. Diameters 93 |)-, 40 i)..? Pores very uneven, 10 — 25 \k + 6 [x,? 

 „ 37. ('. horealis (Cl.), the larger form with byspines on the 4th shell; ■'^"A- 



a. Sea oif Røst, ^-/s 1899, 0—900 m. Optical section, showing the 4 shells. Diameters 132 \>., 89, 38, ^ 17. 



b. The same specimen. A portion of the 3rd shell with one larger and two smaller radial spines and pores, together with 

 a portion of the 4th shell, with pores. 



c. A form Avith well developed byspines on the 4th shell; optical section. The Vest Fiord, V2 1899, 0—200 m. 



d. The same specimen. The portion of the 3rd shell, where the outmost shell is wanting; pores and spines. 



e. The same. A portion of the 4th shell (very thinwalled) with pores, main spines and byspines (slender, oblique). 

 „ 38. Ehizoplegma horeale (Cl.) Jøeg., ''^Vi- 



a. A well developed specimen. Sea off Røst, -/s 1899, 0—900 m. 



b. The same specimen. One of the main spines with surrounding network. 



c. The same. The inner shell; the other parts in optical section. 



d. Young specimen. From the sea between Norway and Iceland, due east of Iceland, 60° 43' n., 3° 1' w., 'V12 1903 (SS 

 Michael Sars). 



