MUSEUM OF COMPARATIVE ZOOLOGY. 283 



DESCEIPTION or PLATES. 



PLATE I. 



Fig. 1. OpUomyxa tuniida, from below ; f . 

 Fig. 2. " " from above ; |. 



Fig. 3. " " arm -joints, profile ; |. 



PLATE II. 



Fig. 1. Ophiotoma coriacea, from below; \. 



Y\<r. 2. " " from above ; \. 



rig. 3. " " arm-joints, profile; ^. 



Fig. 4. Ophiobyrsa Perrieri, from below ; f . 



Fig. 5. " " from above; f. 



Fig. 6. " " arm-joints, profile ; \. 



PLATE III. 



Fig. 1. Pectinura tessellata, from below; f. 



Fig. 2. " " from above ; -f. 



Fig. 3. " " arm-joints, profile ; f . 



Fig. 4. " lacertosa, from below , \. 



Fig. 5. " " from above; \. 



Fig. 6. " " arm-joints, profile ; \. 



Fig. 7. " angulata, from below ; f. 



Fig. 8. " " from above ; f . 



Fig. 9. " " arm-joints, profile ; \. 



Fig. 10. Ophiozona marmorea, from below ; \. 



Fig. 11. " " from above ; \. 



Fig. 12. " " arm-joints, profile ; \. 



Fig. 13. " clypeata, from below ; \. 



Fig. 14. " " from above ; \. 



Fig. 15. " " arm-joints, profile ; \. 



Fig. 16. Ophiochytra tenuis, from below ; \. 



Fig. 17. " " from above ; \. 



Fig. 18. " " arm-joints, profile; 4- 



