114 NOTES ON THE COPEPOPA OF THE 



peculiarity exists outside of tlie family yEtidiincc and extends to the 

 Ev.co.lanidcv. Meanwhile, until this is proved to be tlie case, in which 

 instance the <? described above would be only the S of E. doiifjatus in 

 the last stage but one, I prefer to regard it as a new species. 



3. Gactamis major (sp. nov). This has been referred to by the writer 

 in Proc, Zool. Soc, February 3rd, 1903.* It has much resemblance to 

 G. armiger (Gbt.), but is much larger, reaching a size of over 5 mm. ; 

 the anterior antennai are as long, or longer than the body; the lamellar 

 appendage of the posterior foot-jaw is absent, and the exopodites of the 

 first pair of feet are distinctly three-segmented. 



The S 4G5 mm. long; cephalic spine short; spines of last thoracic 

 segment short; abdomen of five segments; anterior antenuce twenty- 

 two-jointed (24-25, 8-9, 1-2), nineteenth joint long ; oral organs much 

 retrograded ; fifth feet very like those of Gaidius major Z . The 

 dorsal spine of the head at once distinguishes it as a Gactanus. (PI. IX., 

 figs. 7 and 8.) 



4. Gactanus caudani (Canu,? vel nov.). A Gaetanus somewhat re- 

 sembling G. miles (Gbt.), but the anterior antenna only one and a half 

 times as long as the body ; the lamella of the posterior foot-jaw, as in 

 G. miles, not different, as stated by Canu, and the exopodites of the 

 first feet distinctly two-jointed (not three, as in Canu's species) ; the 

 basal of the fourth feet, like G. armiger, i.e. with tubal bristles, and not 

 with spines, as in G. miles (Gbt.). (PI. IX., figs. 20, 21, and 22). 



This may be identical with Canu's sjl>. G. caudani {Ann. Univ. Lyon, 

 v. 26), but if so, the species is subject to variation. His description 

 referred only to a young <? . My specimens, of which there are several, 

 are adult females of a size of 5 mm. and over. 



5. Gaidius major] (Wolfenden). A large Gaidius, 4-65 mm. long (and 

 over), more robust than G. pnngcns (Gbt.), with longer anterior antennae, 

 shorter spines of the last thoracic segment, three-jointed exopodites 

 of the first feet, and endopodites of the second feet clearly of two 

 joints. It is identical probably with the Chiridius hrevispinus of Sars, 

 and his Ch. tenuispinus is almost identical with Giesbrecht's species 

 G. piingens, with which the writer carefully compared it at Naples in 

 April, 1902. J Neither of Sars' species is a Chiridius. 



The 3 averages 3-1 mm. long; the head is united with the first 

 segment, there is a one-pointed rostrum ; the spines of the last seg- 

 ment are slender ; the abdomen, of five segments, only little more than 

 a third of the length of the cephalothorax ; anterior antennte shorter 

 than the thorax, and of twenty-two segments, with long nineteenth 



* "The Plankton of tlio Fahie Cbannel," No. YIII., G. Herljert Fowler. (Proceed. 

 Zool. Soc, 1903.) t Ibid. i Subsequently referred to. 



