194 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Remarks: The species may be distinguished from adhaerens and 

 subadhaerens mainly by its length, the proportions of body and caudal 

 rami, greater development of the curved seta on third antennal segment 

 and ornamentation of that appendage, armature of maxilliped, and 

 ornamentation of fifth legs and from //. elongatus by the third to seventh 

 of these characters. It is not particularly close to any other form. 



Distribution: All that is known at present is that both sexes are 

 external associates of Arenicola cristata from either side of Cape Cod, 

 Massachusetts. Only the later copepod stages are represented in the 

 two collections. 



Literature Cited 



Bakee, E. W., and Whakton, G. W. 



1952. An introduction to acarology, New York, Macmillan Co., xiii + 465 



pp., 377 figs. 



Bocquet, Charles, and Stock, Jan H. 



1957. Copepodes parasites d'inverte'br^s des cotes de France I. Sur deux 

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Boeck, Axel 



1873. Nye slaegter og arter ab saltvands-copepoder. Forh. Vid. Selsk. 

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copepod Clausidium vancnuverense (Haddon). With a note on 

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