BTHANf; TILL K. SV. VRT.-AKAT). HANDL. HAND 18. A1'I). IV. NrO T». 185 



Fig. 3, the epistroma in tlie Arbacia spathiiligera Val. Pag. 8G. 

 Fig. 4, the saine in tbe Arliacia piinctulata Lamck. Pag. 8l>. 

 All tiie tigures niagnified. 



Plalo S. 



Fig. 1 — 8, carly statos and (l(nclo))nicnt of llip opistronia in 

 the Arbacia a?fpiitiiborculata Blv. Pag. 87. 



All the figiires inagnitiod. 



Plate 9. 



Fig. 1 — O, earl}' states and deve]o]inient (>f tho epistroma in 

 tlio Arbacia a-quitiibcrcidata PjLV. Pag. 89. 



Fig. 7. 8, ihe same in the Arbacia stellata P>LV. Pag. 91. 

 All the fignres niagnified. 



