PLATE XII. 
Fig. 1., Cucumaria crocea, Lesson. Ventral view, natural size 
Fig. 2. Cucumaria crocea. Lesson. Dorsal view, natural size. 
Fig. 3. Thy one pervicax, n. sp. Dorsal view, six times the natural size. 
Fig. 4. Actinocucumis typica, Ludwig. Ventral view, natural size. 
Fig. 5. Actinocucumis typica, Ludwig. Dorsal view, natural size. 
Fig. 6. Cucumaria herguelensis, n. sp. Ventral view, natural size. 
Fig. 7. Cucumaria herguelensis, n. sp. Dorsal view, natural size. 
