134 



NOTES ON THE COPEl'ODA OF THE 



end of the segment. First foot: exopodite 1, with partial division into 

 two segments, margin very concave above and convex below, with a 

 marginal bristle not reaching the end of the segment. Appendicular 

 bristle of the tail very long. Colour greenish yellow ; about 8 mm. long. 

 E. gJacialis. The last thoracic segment rounded and without tip. 

 Genital segment very prominent with conical swelling ; genital orifice 

 guarded on each side by an upper and lower tubercle, and opening oval 



1. 

 2. 

 3. 

 4. 

 6. 

 6. 



Fig. 1. Comparison of three species of Euchaeta. 



Euchxta^glacialis. 



I) 



,, Genital segment, ventral surface. 

 norvegica. 



,, Genital segment, ventral surface. 

 barbata, 



,, Genital segment, ventral surface. 



7. Last two segments of cxo25odite of second feet of Eiich. glacialis. 



8. „ ,, ,, ,, Euch. norvegica. 



9. 11 ,, ,, „ Euch, barbata. 



(broader than long) ; the genital swelling occupies more the middle of 

 the segment, which is much swollen laterally. Second foot, with the 

 marginal spine of exopodite 1 very large, reaching the tip of the first 

 spine of exopodite 2 ; the second marginal spine of exopodite 3 larger 

 than in E. norvegica and reaching the end of the segment. First foot 

 without trace of segmentation in the exopodite 1 and its marginal seta 

 very small. Appendicular bristle very siiort. Colour greenish yellow. 



