Studies on the Ostracode Family Primitiopsidae

A sample of Primitiopsidae from the Mulde mar!, probably uppermost Wenlockian of Gotland, is studied. Moulting and growth of Primitiopsis planifrons ]ONES are recorded. A new genus, Clavojabella, and two new species, C. multidentala and C. incurvata, are described. The material as background for a stud y of population dynamics is briefly discussed. A taxonornie survey of the Primitiopsidae is given.