Plate XIII. 



Fig. i. Brisaster (Schizaster) fragilis, 3 m,n . Abactinal side. The number of plates in the paired ambu- 

 lacra could not be made out with certainty. i s/ x . 



— 2. — 2 mm . Abactinal side. The number of plates in the paired ambu- 



lacra not quite certain, likewise the upper plates of the paired 

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



20/ 



/I' 



— 3. — — 2'5 mm . Abactinal side. l 7/ z . 



— 4. — — — 2 mm . Actinal side. The plates of the three anterior ambulacra 



are a little uncertain. 20 / : . 



— 5. — 3-8 mm . Abactinal side. The number of plates in the paired am- 



bulacra not quite certain. l 3/ z . 



— 6. — — 4'5"" n . Actinal side. l 3/ lm 



— 7. — — — Side view. '3/^ 



— 8. — — — Abactinal side. ^/j. 



— 9. — — 3 mm . Side view. l $/j. 



— 10. — 5'5 mm - Abactinal side. II / I . 



— 11. — — 6-6 mm . Actinal side. 9/ r . 



— 12. — — Abactinal side. 9/ x . 



— 13- 7'5 mm - 7i- 



— 14. — 9 mm . — 6 /i- 



— 15. n"" n . — 5 /i- 



— 16 — 20. — — Abactinal side. 3-s/ : . 



