PLYMOUTH MARINE INVERTEBRATE FAUNA. 157 



Many of the records have already been printed in the Journal of the 

 Association and elsewhere. It has not, however, been thought necessary 

 in such cases to give detailed references, as a classified list of papers 

 dealing with work done in the Laboratory has already been published 

 {Jonrn. Mar. Biol. Assoc, vol. vi. p. 115). 



As regards the question of nomenclature, whilst the names used 

 are in general those which it is thought will be finally adopted by 

 zoologists, we have not attached undue importance to this aspect of the 

 matter, but by supplying in each case one reference to a good descrip- 

 tion (preference being given to one accompanied by a figure or to one 

 in a recognised monograph of the group), we have endeavoured to leave 

 no room for doubt as to the precise species which the name is intended 

 to indicate. 



The vast amount of detailed work which the preparation of this 

 paper has entailed has been carried out chiefly by Mr. R. A. Todd and 

 by Mr. S. Pace. A large amount of preliminary work in bringing the 

 records together was carried out by Mr, Todd. The whole, excepting 

 Foraminifera and Worms, has been critically reviewed, extended, and 

 prepared for the press by Mr. Pace, who has also paid special attention 

 to the nomenclature and references employed. 



Each group when completed has been submitted, for critical examina- 

 tion to one or more specialists, to whom, as well as to the authors of the 

 records, the best thanks of the Association are due for the help given. 



Taking the groups in the order in which they are printed, the follow- 

 ing notes as to the relative completeness of the lists, and as to those 

 who have chiefly assisted in their preparation, may be of service. 



Foraminifera. Our records for this group are almost all due to 

 Mr. Pi. H. Worth, who has also arranged the list for publication. It 

 has been submitted to Mr. J. J. Lister, who has made some valuable 

 additions. 



/ Porifera. The list is a very imperfect one, many common species 

 not having been identified and recorded. The records that we have are 

 chiefly due to Prof. E. A. Minchin and Mr. Gl. P. Bidder, both of whom 

 have assisted in tlie revision. 



y Hydrozoa. Most of the species which occur at all frequently are 

 believed to have been included. The lists have all been revised by 

 Mr. E. T. Browne, to whom we are indebted for many additions and 

 suggestions. 



Alcyonaria. Probably gives all the local species. 



ZoANTiiARiA. An incomplete list, no specialist on the group having 

 worked at Plymouth. 



Ctenopiioha. The only frequent species are included, but the 

 number of records is not large. 



