Descriptions of new Metanemerteans. ^3 



Explanatiou of Plate. 



Plate 1. 



Figs. 1 — 11. Ämphiporus greenmani. Arrangement of ocelli on 

 the head, the outlines of the brain given. Figs. 8, 10, 11, from young 

 individuals. From life, X about 15. 



Fig. 12. Proneurotes multioculatus. Position of ocelli on the head. 

 From life, X about 15. 



Fig. 13. Ämphiporus glutinosus. Arrangement of ocelli on the 

 head. From life, X about 15. 



Figs. 14, 15. Zygonemertes virescens. Arrangement of ocelli in 

 the head and oesophageal regions. From life, X about 15. 



Fig. 16. Tetrastemma catenulatum. (Wood's Hell.) Dorsal sur- 

 face of the head and anterior portion of the body. The natural color 

 of the eyes, pigmented mottlings, and brain reproduced. From life, 

 X about 22. 



Fig. 17. Ämphiporus greenmani. Section of the central stilet and 

 basis. Zeiss, camera lucida, oc. 4, obj, C. 



Fig. 18. Ämphiporus glutinosus. Section of central stilet and its 

 basis. Camera lucida Zeiss, oc. 4, obj. C. 



Fig. 19. The same. Section of an abnormal stilet basis. 



Fig. 20. Proneurotes multioculatus. Section of stilet basis. 

 Camei'a lucida, Zeiss, oc. 4, obj. C. 



Figs. 21, 22. Tetrastemma catenulatum. Stilet and stilet basis. 

 Camera lucida, Zeiss, oc. 4, obj. C. 



Fig. 23. Zygonemertes virescens. A curved body out of the body 

 epithelium. Camera lucida, Zeiss, oc. 4, homog. immers. ^jy^^ ^^^^ 

 extended. 



Fig. 24. The same. Central stilet and basis, from an immature 

 individual of 4 mm length. Camera lucida, Zeiss, oc. 4, obj. C. 



Fig. 25. Tetrastemma vermiculum. An unusually large stilet basis. 

 Camera lucida, oc 4, obj. C. 



Fig. 26. The same. An abnormal stilet from a lateral pocket. 

 Free hand drawing, considerably magnified. 



Fig. 27. Proneurotes multioculatus. Transverse section through 

 the body, near the posterior end, the section cutting the commissure of 



