Plate IV. 



2, 3, 9, 14 — 17 Brissopsis lyri/era. i, 4, 13, 18 ^r. eiongata. 5, 19 Brissopsis sp. 6 — 8, 10—12 Hemiaster expergitus. 



Fig. 



I, 

 2 



3 



^■ 



5- 

 6. 



— 9- 



— 10. 



— II 



— 12 



— 13 



— 14 



— 15' 



— 16. 



— 17 



— 18, 



— 19' 



Brissopsis elongata, actinal side. '/i. 



— lyrifera (Mediterranean), abactinal side, '/i- 



— — — actinal side. '/i. 



— elongata, abactinal side. '/j. 



— sp. («Talisman>^), side view. Vi- 

 Hemiaster expergitus, abactinal side, '/i- 



— — side view. 3-5/i. 



— — actinal side, '/i- 

 Brissopsis lyrifera (Mediterranean), side view, '/i- 

 Hemiaster expergitus, abactinal side. 3-5/j. 



— — side view. y,. 



— — actinal side. 3-5/j. 

 Brissopsis elo?igata, side view. '/i. 



— lyrifera (Kattegat), side view. 7i. 



— — (Kattegat), abactinal side, '/i- 



— — (Mediterranean), side view, '/i- 



— — (Kattegat), actinal side, "/i- 



— elongata, subanal fascicle and adjoining parts of the test ^/i. 



— sp. (;; Talisman*), actinal side. 7i- 



