COPEPODA 135 



Y^ (St. V). Size of specimen from Thor St. 88 was 3-16 mm.; anterior division 2'5i mm.; urosome 

 0-65 mm. 



In the shape of the body etc. it is scarcely different from the adult female, but the lateral 

 corner of the thorax is more pointed, showing, however, a similar difference between a more pointed 

 left and a more rounded right corner. In one of five females a strong spine, similar to that of the adult, 

 directed upwards and slightly backwards was found dorsally near the posterior margin of the first ab- 

 dominal somite on the right side; in two other specimens the spine was represented by a single tooth, or 

 a few only; along the posterior margin of the second abdominal somite no short teeth were found. The 

 appendages are in the main like those of the adult females; the Re of the maxillulae possess as usual 

 only 10 setae, of which the median are the shortest; the Se of Re II pes I is shorter than in the adult 

 female, but longer than in the adult male, reaching somewhat beyond the middle of the following seg- 

 ment. The male is always easily distinguished from the female by the presence of a rather short and 

 clumsy fifth pair of legs, of which the left is the longer (text-fig. 35 g). 



Occurrence. The Ingolf Expedition has taken 2 females, of which one with spermatophore. 



1^5 1896 St. 47 6i°32 L. N. i3°4o L. W. V 100— o fathoms. Temp, at surf. io-6° C. 



The Thor has gathered it at the following stations: 



1V7 1904 St. 183 6i°34 L. N. i8°43 L. W. Yt. 1800 M. Wire 7 f ?. 



'5/6 1905 St. 82 5i°oo L.N. ii°43 L. W. Yt. 1200 M.Wire 3 f ?, i fc?. 



29/8 1905 St. 164 6i°2o L. N. ii°oo L. W. Yt. 300 M. Wire i f?. 



76 1905 St. 72 57°52 ly. N. 9°53 L. W. Yt. 1500 M.Wire 11 f? (one with 4 sp.). 



2% 1905 St. 88 48^09 L. N. 8°30 L. W. Yt. 300 M. Wire 90 f ? (35 with sp.), 2 f d", 4 y? (V), 6 yd* (V). 



76 1905 St. 90 47°47 L. N. 8°oo L. W. Yt. 300 M.Wire 125 f? (85 with sp.), 36 fc?, 3 y?, 5 yc?. 



Distribution. This species seems to have a world-wide distribution. It has been recorded from 

 the warm area of the Faeroe-Shetland channel, from the west coast of Ireland as far north as 54° L. N. 

 "at depths of from 400 to iioo fathom.s". It has been taken by the Monaco Expedition and by the 

 Gauss Expedition in the Mid- and South Atlantic as far south as 35° L. S. By the Siboga Expedition 

 it was found rather common in the Malay Archipelago; it was recorded by Giesbrecht from the 

 Pacific (6°20 L. N. 166—173 L. E.) and by Esterly from the Bay of California. 



Remarks. In spite of a few minor differences I am fairly convinced that this species is identical 

 with that described by Giesbrecht. Though Scott's fig. 8 PI. XXII is wanting in details I think his 

 male is identical with that described here. Scott is possibly right in identifying Lubbock's Undina 

 pl/iiiiosa with this male, in spite of minor differences, especially in the structure of the right fifth foot, 

 which may, however, be due to a mistake; as Lubbock's description is rather incomplete, I do not at 

 present accept the name U. pluniosa. 



I think Scott is right in referring the female of Brady's Eiichcete pulchra Lubb. to U. minor. 

 As far as I understand Scott, he refers Brady's Euchaie pulchra $ and his E. australis ? to the same 

 species, but when we compare Brady's fig. 5 PI. 21 and fig. 6 PI. 14, it is easily realised that the two 

 animals are probably not identical, especially on account of the different shape of the genital somite. I 



