Plate IV. 



2, 3, 9, 14—17 Brissopsts /yrt/era. i, 4, 13, 18 Br. elongaia. 5, ig Byissopsis sp. 6—8, 10—12 Hemiaster expergifus. 



Fig. I. Brissopsis elongata, actinal side. '/i- 



— 2. — lyrifera (Mediterranean), abactinal side. Vi- 



— 3. — — — actinal side. '/i- 

 — ■ å,- — elongata, abactinal side. '/j. 



— 5. — sp. (« Talisman •>), side view. Vi- 



— 6. Hcviiaster cxpcrgitus, abactinal side. Vi- 



— 7. — — side view. 3-5/j. 



— 8. — — actinal side. Vi- 



— 9. Brissopsis lyrtfcra (Mediterranean), side view. Vi- 



— 10. Hemiaster expergitus, abactinal side. 3-5/^. 



— II. — — side view. Vi- 



— 12. — — actinal side. 3-5/j. 



— 13. Brissopsis elongata, side view. Vi- 



— 14- — lyrifera (Kattegat), side view. Vi- 



— 15. — — (Kattegat), abactinal side. Vi- 



— 16. — — (Mediterranean), side view. Vi- 



— 17. — — (Kattegat), actinal side. Vi- 



— 18. — elovgata, subanal fasciole and adjoining parts of the test. ^/i. 



— 19. — sp. ((Talismans), actinal side. Vi- 



