Plate XIII. 



Fig. I. Brisasfcr (Schizastcr) fragilis, 3""". Abactinal side. The nnmber of piates in the paired ambu- 



lacra could not be made ont with certainty. '7i- 



— 2. — — — 2""". Abactinal side. The number of piates in the paired ambu- 



lacra not quite certain, likewise the npper piates of the paired 

 interambulacra and the piates of the anal area a little uncertain. 



— 3. — — — a-S"™. Abactinal side. '7/i- 



— 4. — — — 2""". Actinal side. The piates of the three anterior ambulacra 



are a little uncertain. ^o^j. 



— 5. — — — 3-8™"'. Abactinal side. The nnniber of piates in the paired am- 



bulacra not quite certain. 's/i- 



— 6. — — — 4'5""°- Actinal side. '3/i. 



— 7. — — — — Side view. '3/j. 



— 8. — — — — Abactinal side. 's/j. 



— 9. — — — 3""°. Side view. '?/i- 



— 10. — — — S'S"™. Abactinal side. "/j. 



— II. — — — 6-6""". Actinal side. 9/j. 



— 12. — — — — Abactinal side. 9/i. 



T O '-T* r-mni 8 / 



— ^3- — 7 5 • /I- 



— 14. — — — 9""°. — — 7i- 



— 15. - — - II-"™. - - 5/j. 



— 16 — 20. — — — Abactinal side. 3-5/,. 



