DYSPONTIDS. 65 



Two or tliree specimens, undoubtedly belonging to 

 this species, I obtained from a sponge dredged in 

 WestportBay, Ireland, but the dissections which I made 

 are unfortunately not in a condition good enough to 

 allow of minute description. ISTor would any good end 

 be served by transferring M. Boeck's description to 

 these pages. The siphonostomous Copepoda require 

 and will well repay a laborious investigation, a work 

 of no very great difficulty, if only a liberal supply 

 of specimens could be obtained. Those which are 

 to be found in the simple Ascidians might probably 

 be obtained readily in sufficient numbers ; but in the 

 case of the free-living species, seeing that they are but 

 seldom found, and then must be picked out with great 

 labour from a mass of dredged or net-collected 

 Microzoa, the impediments are rather serious. Except 

 Gyclopicera nigripes, which occurred in some plenty 

 amongst material dredged off the Yorkshire coast, 

 I have rarely met with more than two or three 

 examples in a single gathering. 



Genus 3. Dyspontius, Thorell, 1859. 



Like Artotrogus, except that the posterior antennae 

 consist of only three joints, the fourth pair of ^feet are 

 destitute of an internal branch, and the fifth pair are 

 altogether wanting. The abdomen contains, in both 

 sexes, one segment more than in Artotrogus, 



VOL. III. E 



