title: The ultrastructure of the polar lobe of Crepidula fornicata (Gastropoda, Prosobranchia).
abstract: Some novel structural features of the polar lobe of the egg of Crepidula are described. The significance of two kinds of aggregate is discussed in relation to the morphogenetic factors present in polar lobes generally. Surface configurations of the polar lobe are also described.
mesh_terms: D000818:Animals; D003593:Cytoplasm / Q000648:ultrastructure; D005260:Female; D008855:Microscopy, Electron, Scanning; D008974:Mollusca / Q000196:embryology* / Q000648:ultrastructure; D009940:Organoids / Q000648:ultrastructure; D010063:Ovum / Q000648:ultrastructure*