COPEPODA 



Distribution. This species has been taken off the west coast of Ireland, in the Mediterranean, 

 in the South Atlantic as far south as 25 L,. S., in the Indian ocean, and in the Pacific. 



58. Euchaete hebes Giesbrecht. 

 (PI. VI figs 13 a — b; text-fig. 57.) 



1888. Euchaete hebes n. sp. Giesbrecht, p. 337. 



1892. — Giesbr. Giesbrecht, p. 246, Taf. 15 and 37 



figs 15 — 16. 

 1894. ? — — Th. Scott, p. 59, pi. VI figs 18-19. 



1898. — Giesbrecht & Schmeil, p. 39. 



1903. — Lo Bianco. 



1905. — Gough, p. 336, figs 4—7. 



1905 

 1906 

 1908 

 1909 

 1910 

 1911 

 1912 



Euchaete hebes Giesbr. G. O. Sars, p. 4. 



Norman & Scott, p. 128. 



v. Bremen, pp. 51—52 fig. 57. 



Pesta, p. 24. 



Steuer, p. 24. 



Farran, pp. 94—95. 



Pesta, p. 22. 



Description. f$. Size: 3-54 mm. ; anterior division (1-56 + 0-99) = 2-55 mm. ; urosome 0-99 mm. 

 Giesbrecht's specimens measured 2 - 85 — 2*95 mm. 



Near the lateral margin of the last thoracic somite is found, dorsally, a membranous fringe bearing 

 short hairs; it is not equally prominent in all specimens, but generally more so than shown in fig. 13 a. The 

 abdominal somite I c\i II has, dorsally, a characteristic process, and, on each side of the 

 vulva lamelli-form processes more developed, on the right side. One of the 6 apical setae 

 of the maxillae shows the structure characteristic of Pareuchcete with several short 

 teeth and a few larger branches. The number of glandular pores in the legs scarcely 



Text-fig. 57. 

 Euchcetehebes Gbt. differs from those of E. norv., except by the absence of any pore at the base of Se 1 Re III. 



Yd 1 (St. V). Pes v The epistoma and the outer surface of the labrum are in main features like 



X 39- 



those of E. norv. The oral surface has the two first groups placed rather longitudinally, 



and the three following ones fairly well separated. The area in front of the lamina labialis is, as shown 



in fig. 13 b, rather characteristic, especially by the lateral group of hairs, which is a longitudinal series 



in continuation of the serrula 6-dentata. 



o*. Size: 3-03 mm.; anterior division (1*35 -j- 078) =213111111.; urosome 0-9 mm. Giesbrecht's 

 specimens measured 275 mm. 



Lateral corners are rounded and somewhat more produced on the right than on the left side; 

 on both sides is, dorsally, the usual fairly well developed tooth. The first abdominal somite has on each 

 side, dorsally, a similar tooth as in E. norv. The antennulae reach distinctly beyond the end of the 

 cephalo-thorax; the segments 12 — 13 are, posteriorly, indistinctly separated, and more so on the left side. 



The Re I of pes V has a fairly well developed Se. 



o* (St. V). Size: 2 - 68mm.; anterior division (1-19 -j- 075) = 1-94; urosome 074 mm. 



The lateral corners of the thorax are regularly rounded without the mentioned hairy fringe. 

 The subapical seta of the furca is only a little longer than the St. 2. Pes V differs from E. norv. by a 

 more rounded Ri sin.; the outlines of the exopodites are, as realised by comparing text-figs 47! and 

 57, somewhat different. 



Occurrence. Within the area explored by the Ingolf Exp. this species has not been taken; but, 

 as it has been, gathered by the S/S Thor 2I / 6 05 St. 90 47°47 L,. N. 8°oo L. W. (viz: 23 f°. (2 with egg- 

 sacs), 2 f d\ 1 yo* (V)), I have included it here. As the species has only been found in the Mediterranean 





