COPEPODA 



153 



The first pair of legs has the inner margin of the third basipodite less produced than in the 

 preceding species; the Se of Re I is rather short, but strong, and the Se of Re II, which is fairly strong, 

 extends only a little beyond the middle of Re III; the other natatory legs are scarcely different. 



The fifth pair of legs is in main features like that of Ch. notacantha, but differs in several de- 

 tails. The right endopodite (text-fig. 43 c) has a more regular shape, and has a somewhat different shape 

 terminally ; the third segment of the right exopodite (text-fig. 43 c) has, inwards, characteristic incisions 

 and processes. The left endopodite has a more regular shape, and is terminally produced into a short 

 tooth (text-fig. 43 d). The second segment of the exopodite is of more equal breadth throughout, and 

 the third segment is distinctly more slender (text-fig. 43 e) ; the arrangement of the series of hairs on 

 the posterior surface of Re III shows characteristic features of specific value (fig. 8 a PI. V). 



Text-fig. 43. Chirudina parvispina Farr. 



a. f cT- Abdomen >( 22. b. Head X 22. c. Pes V dext Ri -|- Re X c. 50. d. Pes V Ri sin. X 66. e. Pes V sin. Re II III 

 X 75- f- yd 1 (Stage IV). Head X 66. g. Abdomen X 66. h. Pes V X c. 80. 



Occurrence. The S/S Thor has gathered this species at two stations viz: 



"/ 7 1904 St. 183 6i30 L,. N. I7o8 L. W. Yt. 1800 M. Wire i f d 1 , 2 yd* (V), ay? (V), i y? (IV), i yo* (IV). 

 '% 1904 St. 1 80 6i34 L. N. i903 L. W. Yt. 1800 M. Wire i yj* (V). 



This species has only been recorded by Far ran from the west coast of Ireland between 580 

 and 680 fathoms at 5453 L,. N. io42 L. W. in the month of November 1904, and at 5457 L. N. io5i 

 L,. W. in the month of February 1905. 



Remarks. The specimen (young male) described by Far ran is scarcely different from my 

 specimens. The female is perhaps identical with Und. spectabilis G. O. Sars (1900, p. 59), which is, how- 

 ever, much bigger (f ? 8 mm.), but in other respects, except by the shorter Se of Re I pes I, is scarcely 

 different in any features of importance. If, however, Sars' male (6 mm. long) and female really belong 



The Ingolf- Expedition. III. 4. 



20 



