Ultrastructure of the pericardium in chitons (Mollusca: Polyplacophora), in relation to filtration and contraction mechanisms Steinar Økland OriginalPaper Pages: 193 - 203
The stylet apparatus of the nemertean Paranemertes Peregrina: Its ultrastructure and role in prey capture Stephen A. StrickerRichard A. Cloney OriginalPaper Pages: 205 - 223
Abdominal segment formation in Spirorbis moerchi (Polychaeta) Herbert E. Potswald OriginalPaper Pages: 225 - 245
Dart formation in Helix aspersa (Mollusca, Gastropoda) Richard M. Dillaman OriginalPaper Pages: 247 - 261
Zur Entstehung der Gemmulae bei Ephydatia fluviatilis L. (Porifera) Paul-Friedrich Langenbruch OriginalPaper Pages: 263 - 284
Cuticular structures of the priapulid Halicryptus spinulosus: A scanning electron microscopical study J. A. Merriman OriginalPaper Pages: 285 - 295
The ultrastructure of the blood vessels of Branchiostoma lanceolatum (Pallas) (Cephalochordata) Hans Rähr OriginalPaper Pages: 297 - 308