Tafel X. 



Fig. 1. Derbyia grandis WAAG. Ventralklappe. Exemplar N 420. Store Bjornekap. 



NatQrliche Grosse. 



2. Spirifer Nikitini TSCHERNYSCHEW. Ventralklappe. Store BjGrnekap. Exem- 

 plar N 458. Natflrliche GrOsse. 



3. Spirifer condor d'ORB. Ventralklappe. Store BjSrnekap. Exemplar N 447. 

 NatOrliche Grfisse. 



