PLATE LIX. 



Fig. 



1. Head and anterior region of Mag alia per armata, De St. Joseph. Enlarged. 



2. Candal region of the same. Enlarged. 



3. Female of Splixrosyllis hystrix, Clap., with ova attached to the ventral surface. 



Ventral view. Enlarged. 



4. Male example of the foregoing with long (swimming-) bristles, from the coast of 



Co. Down, Ireland. Enlarged. 

 4a. Head of the foregoing species. X Zeiss oc. A, obj. 4, with draw-tube. 



5. Exogone gemmifera, Pagenstecher, from St. Andrews, with flask-shaped embryos 



attached to feet on the ventral surface ; c natural size, a and b enlarged. 



6. Proboscis of the same and the proventriculus. Enlarged. 



7. Xenosyllis Kinbergi, n.s., from the dorsum. Enlarged. 



8. Head of Sphserosyllis hystrix, Clap., with an additional eye-speck on each side in 



front. The tentacles are incomplete. Enlarged. 



9. Anterior region of Mlcrosyllis Marenzelleri, n.s. (fragmentary), from the Sound of 



Harris, x about 40. 



10. Head of Pionosyllis prolifera, Krohn, var. Malmgreni. Enlarged. 



11. Anterior region of Eusyllis tubifex, Gosse, in life, showing the arrangement of the 



proboscis, proventriculus, and stomach. X about 45. 



12. Head of Pionosyllis divaricata, Kef erst. Enlarged. 



13. Head of Eusyllis tubifex, Gosse. Enlarged. 



14. Head and anterior region of Odontosyllis gibba, var. Robertianse, in life, from Guernsey. 



Enlarged. 

 14a. The same in spirit. Enlarged. 



15. Head and anterior region of Odontosyllis fulgurans, Aud. and Ed. Enlarged. 

 15a. Tail of the same. Enlarged. 



156. Tail (incomplete) of example of the foregoing from Plymouth. Enlarged. 



16. Head of Ioida from Plymouth, September 14th, 1905. Enlarged. 

 16a. Tail of the foregoing. Enlarged. 



