PLATE XII. 
Phormosoma placenta Wtv. Thoms. 
Fig. 1. Seen in profile, natural size. 
Fig. 2. Same seen from the abactinal side. 
Fig. 3. Same seen from the actinal side. 
Fig. 4. Portion of actinal system denuded, magnified. 
Fig. 5. Coronal plates of the abactinal side, near the ambitus, magnified. 
Fig. ■ 6. Edge of test, showing the ambital fasciole from the abactinal side, magnified. 
Fig. 7. Portion of test, facmg the ambital fasciole, magnified. 
Fig. 8. One of the club-shaped spmes of the actinal surface, magnified. 
Fig. 9. Denuded abactinal system, somewhat magnified. 
