COPEPODA 



179 



52. Euchaete Scotti Farrau. 

 (PI. VI figs 10 a — c; text-figs 51 a— j.) 



1908. Euchaste Scotti 11. sp. Farran, p. 42, pi. Ill figs 11 — 13. 



191 1.? — Fair. Wolfenden, pp. 301— 302, pi. XXXV fig. 2, text-figs 53 a— c. 



Description. f£. Size of specimen from St. 183 was 5-99 mm.; anterior division 4-26 mm.; uro- 

 some 173 mm. Farran's specimens measured 57— 6-3 mm., Wolfenden's specimens measured 4-2— 

 4-85 mm. 



The shape of the body is more robust than in the preceding species, as the anterior part is 

 only c. 2-3 as long as wide, and as wide as the urosome is long. The lateral corner of the cephalo- 

 thorax is not quite regularly rounded, but somewhat triangularly produced; the anterior division is 2*5 

 as long as the urosome, which shows the following proportion between the three first somites (15, 8-5, 



Text- fig. 51. Ezichcete Scotti Farran. 



a— d. f 9. Genital somite X 18. e. f 9- Vulva from below X 180. f. irf. Left corner X 18. g— h. YQ—d (St. V). Abdomen 



from the left X 24. i. Yd 1 (St. V). Lateral corner X 15. j- Yd" (St. V). Pes V X 15- 



8-5). The genital somite, which is 1-3 as long as wide and i;a as long as deep, is in dorsal view slightly 

 asymmetrical, and has the lateral margins strongly convex, somewhat in front of the middle. The 

 genital prohtberance has in lateral view a wing-like anterior process, sometimes slightly concave in the 

 middle, and a more dorsal and posterior process, separated from the former by a distinct incision (text- 

 figs 51 a— e). In ventral view the vulva shows some similarity to Wolfenden's figure 53 a, which is, 

 however, too incomplete for a detailed comparison, and is distinctly different from the mentioned 

 species of this group. The posterior incision in the median plate is not observed; the anterior tri- 

 angular point, of which an oval plate is found, is just indicated. 



The antennulae extend just beyond the end of the third thoracic tergite, but not to the end of 

 the cephalo-thorax ; the segments 24^25 are as long as the segment 19; the appendages scarcely show 

 differences from those of E. norvegica. The mouth-limbs are scarcely different from those of £. barbata; 



23* 



