6 9 



The outer-edge spines on the exopodite of the second pair of feet are comparatively 

 short and stout. The outer-edge spine on the second joint is longer and stouter than the others, 

 but it ialls considerably short of the base of the first outer-edge spine on the third joint. 



The third and fourth pairs of feet are almost similar to those of Euchaeta marina. 



Male — length 2,7 mm. 



The males are very like those of Euchaeta marina in general appearance, but are 

 easily recognised by the difference of the armature on the projection of the second joint of the 

 exopodite of the left fifth foot. The spinules are small and closely set, and the apex of the 

 projection is deeply notched. The second joint of the left exopodite is furnished with four long 

 and moderately strong spines on the inner margin, opposite the apex of the projection. 



The female of Euchaeta wolfendeni, is undoubtedly the same as the form which is wroncdy 

 described and figured by Wolfenden as Euchaeta marina, in his report .on the Copepocla collected 

 by J. Stanley Gardinek around the Maldive Islands. There appears to be some confusion 

 between Wolfenden's description and figure of the exopodite of the second pair of feet, which 

 renders the identification rather difficult at first sight. The description of the outer-edge spines 

 on the exopodite of the second pair of feet agrees with what is found in typical Euchaeta 

 marina, but does not agree with the figure 8 on plate C. The description of the spines both 

 of Euchaeta indica and of Euchaeta marina in W< u.fknden's report, has evidently been drawn 

 up from the figure 16 on plate C. 



This species appeared to be fairly well distributed in the Malay Archipelago. Males and 

 females were not uncommon in the plankton collected by the 'Siboga'. The species was present 

 at the followincr stations. 



o 



Stat. 36. — Stat. 37. — Stat. 66. — Stat. 81. — Stat. 98. -- Stat. 110. — Stat. ti; a . — 

 Stat. 121. — Stat. 124. — Stat. 125 (day). -- Stat. 128. - - Stat. 136. — Stat. 138. — 

 Stat. 141. — Stat. 142. — Stat. 157. — Stat. 165. — Stat. 172. — Stat. 1S4. — Stat. 189". — 

 Stat. 217 (surface). — Stat. 217 (horizontal cylinder). — Stat. 220 (surface). — Stat. 220 

 (vertical net). — Stat. 223. — Stat. 224. — Stat. 225. — Stat. 229. — Stat. 245. — 

 Stat. 276. — Stat. 282. — Stat. 315. 



Euchaeta zvolfcndcni may prove to be widely distributed in the warm seas. Owing to 

 its general resemblance to Euchaeta marina, however, it may be easily overlooked. I have 

 specimens of this species from the plankton samples collected by Professor Herdman between 

 Aden and Colombo, during his traverse to Ceylon and back in 1903. 



The species is named in compliment to Dr. R. N. Wolfenden, whose investigations of the 

 plankton of the deep water of the North Atlantic, have revealed a number of interesting Copepoda. 



Genus Paraeuchaeta nov. 



This genus is establishecl for the reception of the Eztchacta-like forms of which Boeck's 

 Euchaeta norvegica is the type. 



The females are distinguished from true Euchaeta by the armature of the spines on the 

 apex of the first maxillipedes. These spines are densely furnished with fine short spinules only. 

 The long spinules, which are so characteristic in true Euchaeta, are entirely absent. 



69 



