COPEPODA 



157 



Occurrence etc. The S/S Thor has twice gathered a few specimens of this interesting species, viz: 



"/ 7 1904 St. 183 6i30 L. N. I7o8 L. W. Yt. 1800 M. Wire 3 f $ (one with 2, the others with single egg- 

 sac), 2 yd 1 (V), i y (III). 

 IO / 7 1904 St. 180 6i34 L,. N. I9O5 L. W. Yt. 1800 M. Wire 4f? (one with 2 egg-sacs), i y<? (V). 



On the west coast of Ireland "three specimens of this species were taken at depths of 700, 730 

 and 1150 fathoms. By Wolf end en it has been recorded at about 20 L,. S. and 20 L,. W. On account 

 of the longer antenuulae and well developed Se Re I pes II I think with Farran, in contrast to 

 Wolf end en, that this species is well distinguished from V. oligarthra Steuer from the South Atlantic. 



Euchaetidae. 



Euchaete Philippi 1843. 



A. Scott has established a new genus (1911 p. 64) Pareuchate with E. norvegica as a type in 

 contrast to the true Euclmtc with E. marina as type species; the latter is characterized by the fifth 

 pair of the legs in the male, which has the Re III of the left foot elongated and pointed, and in 

 the females "two of the six apical spines on the first maxilliped, in addition to being furnished with 

 rows of very short spinules have also a number of moderately long and conspicuous spinules". The 

 latter characteristic is very interesting, but probably not important enough for the establishment of 

 a new genus, especially as a single apical seta of the mentioned structure was found in E. hebes, in 

 which pes V of the male is of the E. norvegica type; in E. acuta only a single seta of this structure 

 was found. 



In spite of specific variations the structure of the epistoma, and the anterior and posterior surface 

 of the labrum show, as seen by comparing the figures on PI. VI and the descriptions, common features; 

 the arrangement of the hairs in front of the lamina labialis is fairly characteristic. 



The arrangement of the glandular pores in the legs does not show specific difference of great 

 value. In the outer margin of Re III pes I, somewhat beyond the middle, a glandular pore was found, 

 alike, but less distinctly developed than the corresponding pore in Valdiviella insignis Farr. (PI. VI fig. 

 2 a). In the second pair of legs a pore is found at the base of Se Re II and Se 3 Re III as well as 

 one minute one near the tip of Ri III; in the third and fourth pair, in addition to these, a pore is 

 found at the base of Se Re I. 



In this genus the adult females show the most characteristic systematic features, especially 

 in the structure of the genital somite; it must be remembered, however, that the usual inspection of 

 the genital area from the side and from below is not quite satisfactory for a full estimation of the 

 characters. A full dissection is often necessary to understand the complicated structures of the vulva; 

 unfortunately, I have not had the opportunity of doing so at the present. The characters found in the 

 number of setae in the maxillulae, as well as in the relative length of the spines in the exopodite of 

 the second pair of legs are of value, but often show some variations. To refer the copepodites as well 

 as the adult males to the right species is often impossible. 



