1. Ultrastructure and formation of the body cavity lining in Phoronis muelleri (Phoronida, Lophophorata)

   • T. Bartolomaeus

   Original Article Pages: 135 - 148

2. The spermathecal epithelium, sperm and their interactions in the hermaphroditic land snail Arianta arbustorum (Pulmonata, Stylommatophora)

   • Nenad C. Bojat
   • Ursula Sauder
   • M. Haase

   Original Article Pages: 149 - 157

3. Pigmentation and tunic cells in Cystodytes dellechiajei (Urochordata, Ascidiacea)

   • Eva-Maria Rottmayr
   • Bert Steffan
   • G. Wanner

   Original Article Pages: 159 - 170

4. Hydropy and ultrastructure of egg envelopes in Aleochara bilineata (Coleoptera, Staphylinidae)

   • Marie-Josée Gauvin
   • G. Boivin
   • Jean-Pierre Nénon

   Original Article Pages: 171 - 175

5. Sperm dimorphism and spermatozeugmata in the commensal bivalve Pseudopythina macrophthalmensis (Galeommatoidea, Kelliidae)

   • Å. Jespersen
   • Takeharu Kosuge
   • Jørgen Lützen

   Original Article Pages: 177 - 189