236
J O H N R U N N S T R Ö M
FIG. 8. Cortical particle of Paracentrotus lividus. Cross section through the
filaments of the lamella which is surrounded by three extralamellar bodies; outermost is the particle membrane. X 60,000.
FIG. 9. Longitudinal section through two adjacent cortical particles of Paracentrotus lividus. Left arrow, connections between basal region of lamella and extralamellar bodies; right arrow, connection between basal region and particle membrane. X 60,000. (Baxandall.)
J O H N R U N N S T R Ö M
FIG. 8. Cortical particle of Paracentrotus lividus. Cross section through the
filaments of the lamella which is surrounded by three extralamellar bodies; outermost is the particle membrane. X 60,000.
FIG. 9. Longitudinal section through two adjacent cortical particles of Paracentrotus lividus. Left arrow, connections between basal region of lamella and extralamellar bodies; right arrow, connection between basal region and particle membrane. X 60,000. (Baxandall.)