Plate î. 



Fig. 1. CaUioplana marginata Stimpson. 



Fig. 2. Pseudoceros nigromarginahis, n. sp. 



Fig. 3. Pseudoceros reticulatus, n. sp. 



Fig. 4. Planocera reticulata (Stimpson). 



Fig. 5. Pseudoceros luteomarginatus, n. sp. 



Fig. 6. Pseudoceros lacteus (Collingwood) ? 



Fig. 7. Planocera purpurea, n. sp. 



Fig. 8. Prosthiostomum marmoratum, n. sp. 



Fig. 9. Cycloporus papillosus (M. Sàrs). 



Fig. 10. Pseudostyîochus obscurits, n. gen., n. sp. 



Fig. 11. Thysanozoon brocchii (Grube). 



