378 MR. E. R. LANKESTER ON NEW BRITISH POLYNOINA. 
notus imbricatus in the British Museum, and briefly noticed in the Catalogue. The 
Aphrodita imbricata of Linnæus is considered by Malmgren to be identical with L. cit- 
ratus of Johnston and Audouin and Milne-Edwards; and hence the name imbricatus must 
be changed. I propose.to give the specific title Jeffreysii to this form, in honour of my 
friend Mr. Gwyn Jeffreys, F.R.S., through whose kindness. I have been able to make 
these few remarks on the Annelida of Guernsey. The Alentia gelatinosa of Sars, Kinberg, 
and Malmgren appears to be very closely allied, and may perhaps turn out to be but a 
boreal form of the same species. The. description which I have given above is = 
similar to that given by Malmgren of A. gelatinosa. 
DESCRIPTION OF THE PLATE. 
PLATE LI. 
Fig. 1. Antinoë nobilis, n. sp., natural size. Herm. 
Fig.2. Head of A. nobilis, viewed from above: a, prostomial tentacle ; 6, base of the prostomial tentacle; 
c, antennæ; d, cephalic or optic lobes; e, palps ; f, peristomial cirri. 
Fig. 3. Parapodium and appendages of A. nobilis. 
Fig. 4. Head of À. nobilis, viewed from See letters as before; 9, neuropodial cirrus of the first 
truncal somite, or “ buceal cirrus.’ 
Fig. 5. Elytron of A. nobilis, highly magnified, showing the peculiar arrangement of the endoplasts. 
Fig. 6. A portion of the margin of the same elytron, viewed from below. 
Fig. 7. Neuropodial cirrus of A. nobilis. 
Fig. 8. Notopodial seta of A. nobilis. 
Fig. 9. Neuropodial seta of A. nobilis. 
Fig. 10. Head of Harmotho? Sarniensis, viewed from above. Letters as before. 
Fig. 11. Head of Harmothoé Malmgreni, viewed from above. Letters as before. 
Fig. 12. Head of Halosydna Jeffreysii, viewed from above. Letters as before. 
Fig. 13. Head of Antinoé Zetlandica, viewed from above. Letters as before. The peristomial cirri and 
the prostomial tentacle are wanting. 
Fig. 14. Harmothoé Sarniensis, natural size. Guernsey. 
Figs. 15,16. Elytra of H. Sarniensis. : 
Figs. 17, 18. Elytra of A. Zetlandica, twice natural size. 
Fig. 19. First truncal somite of H. Jeffreysii. 
Fig. 20. Second ditto. 
Fig. 21. Third ditto. 
Fig. 22. Neuropodial seta of A. Zetlandica. 
Fig. 23. Notopodial seta of A. Zetlandica. 
Fig. 24. Portion of the elytron of H. Sarniensis. 
Fig. 25. Elytron of H. Malmgreni. 
Fig. 26. Neuropodial seta of Halosydna Jeffreysii. 
Fig. 27. Notopodial seta of ditto. 
Fig. 28. Neuropodial seta of H. Malmgreni. 
