Plate I. 



Fig. i. Spatangus altus Ltk. Type-specimen, actinal side. I / I . 



— 2. — — — abactinal side. l / t . 



— 3. — — — side view. I I I . 



— 4. — Rasc/ii, the abactinal side. I l 1 . 



— 5. — — - actinal — 1 / I . 



— 6. Brisaster (Schizaster) fragilis, abactinal side. (Specimen from the «Ingolf»-St. 35.) I / 3 



— 7. — — abactinal side. (Specimen from Bergen.) I I I . 



