title: The distribution of annulate lamellae in eggs and zygotes of the sand dollar, Echinarachnius parma.
mesh_terms: D000818:Animals; D005260:Female; D008854:Microscopy, Electron; D010063:Ovum / Q000648:ultrastructure*; D012617:Sea Urchins; D015053:Zygote / Q000648:ultrastructure*