COPEPODA I35 



Yg (St. V). Size of specimen from Thor St. 88 was 3-16 mm.; anterior division 2-51 mm.; nrosome 

 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. 



I2 / 5 1896 St. 47 6i°32 L. N. i3°4o L. W. V 1 100— o fathoms. Temp, at surf. io-6° C. 



The Thor has gathered it at the following stations: 



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



^/e 1905 St. 82 5i°oo L.N. n°43 L. W. Yt. 1200 M. Wire 3 f ?, 1 f<?. 



2 9/s 1905 St. 164 6i°20 L. N. n°oo L. W. Yt. 300 M. Wire 1 f$. 



8 / 6 1905 St. 72 57°52 L. 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 y<? (V). 



Ve 1905 St. 90 47^7 L. N. 8°oo L. W. Yt. 300 M.Wire 125 f? (85 with sp.), 36 fd\ 3 y?, 5 yo*. 



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

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

 "at depths of from 400 to 1100 fathoms". 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 

 plumosa 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. plumosa. 



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

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

 species, but when we compare Brady's fig. 5 PI. 2 J 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 



