206 J. E. DuERDEN — Jamaican Actiniaria : 



It is evident that we have in West Indian waters many species of small Zoan- 

 thids commensal with sponges ; and, vs^here such very few external characters are 

 available for diagnostic purposes, their identification with previously described 

 forms must be a matter of some uncertainty, unless one has the actual types or a 

 number of the different species for comparison. When this can be done it will be 

 found much easier to unite supposed new forms with the older than to rectify the 

 confusion of synonymy. 



Now that a few more representatives of these commensal anemones are avail- 

 able for comparison the present species appears to agree more closely with 

 Duchassaing and Michelotti's Gemmaria Swiftii than does the form I identified as 

 such in the former paper on the Jamaican Zoanthese. 



REFERENCES. 



1767. Ellis, J. : 



" An account of the Actinia sociata, etc." — Phil. Trans., vol. Ivii. 



1786. Ellis, J., and Solandee, D. : 



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1788. Gmelin, J. F. : 



In Limiffius' " Systema naturae." — Edit, xiii., Lipsiffl. 



1817. Lesueur, C. A. : 



" Observations on several species of the genus Actinia. Illustrated by figures." — Jour. Acad. 

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" A History of British Zoophytes," 2nd Edit. — London. 



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1857. Milne-Edwaeds, H. : 



" Histoire Naturelle des Coralliaires or Polypes proprement dits," vol. i. — Paris. 



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" Actinologia Britannica. A History of the British Sea- Anemones and Corals." — London. 



