1. Cytotaxonomy of the monopodial orchids of the African and Malagasy regions

   • J. C. Arends
   • F. M. Van der Laan

   OriginalPaper Pages: 81 - 94

2. Altitudinal variation in Arianta arbustorum (Mollusca, Pulmonata) in the Swiss Alps

   • H. Buria
   • W. Stahel

   OriginalPaper Pages: 95 - 108

3. Distribution of silver-stained nucleolus-organizing regions in the chromosomes of the Equidae

   • I. K. Gadi
   • O. A. Ryder

   OriginalPaper Pages: 109 - 116

4. Genome analysis of ground squirrels of the genus Citellus (Rodentia, Sciuridae) II. DNA sequence organization

   • A. A. Ginatulin
   • L. K. Ginatulina
   • N. N. Vorontsoy

   OriginalPaper Pages: 117 - 128

5. Interspecific comparisons of polytene chromosomes in the genus Parasarcophaga (Sarcophagidae: Diptera)

   • D. Kaul
   • R. R. Tewari

   OriginalPaper Pages: 129 - 138

6. Effects of allozyme variation on fitness components in Drosophila melanogaster

   • J. M. Serradilla
   • F. J. Ayala

   OriginalPaper Pages: 139 - 146

7. Some apparently simple relationships involving missing scutellar bristles in scute mutants of Drosophila melanogaster

   • B. Wallace

   OriginalPaper Pages: 147 - 158