PLATE VI 



Fig. 



1. Lineus bilineatus, Delle Chiaje. Enlargech 



2. Micrura fasciolata, Ehrenberg. Enlarged. 



3. Micrura fusca, n. s. Enlarged. The reddish band on each side is caused by the 



nerve-cord. 



4. Young specimen of Micrura fusca ? showing the early condition of the eye-specks, and the pro- 



portionally larger size of the head. 



5. Portion of the tube of Nemertes carcinophila. X 55 diam. 



6. Fragment of the outer surface of the same. X 350 diam. 



7. Transverse section of the cutaneous tissues of Lineus bilineatus, so as to show the arrangement 



of the two white dorsal bands. X 90 diam. 



