200 DISCOVERY REPORTS 



Cyllopus magellanicus, Dana, and C. lucasii, Bate. The genus Cyllopus is confined to 

 the southern hemisphere, and has not been taken north of 30 S. We have not distin- 

 guished the species in our analyses, but Dr Barnard has informed us that both C. magel- 

 lanicus and C. lucasii are present in our collections in the region. They were widely 

 distributed but only occasionally abundant ; a complete record of the occurrence of the 

 genus is given in Appendix II. Barnard (1932) states that C. lucasii is the more southerly 

 form. Whilst the numbers taken in our N 70 V nets were small they indicate that the 

 genus belongs to the cold Antarctic surface layer and a mixture of this water with the 

 warmer water below; this is indicated in the following table. 



Table XXV 

 The depth distribution of Cyllopus spp. as shozvn by the N 70 V nets 



Barnard (1932) has already shown that both species exhibit a migration towards the 

 surface during the night, and our N 100 H results support this. This migration is further 

 described and illustrated on p. 237 and in Fig. 122. 



C. magellanicus has previously been taken in the Antarctic by the National Antarctic 

 (Discovery) (Walker, 1907) and Terra Nova (Barnard, 1930) Expeditions, and C. lucasii 

 by the latter expedition only. 



Amphipoda alia. The number of remaining unidentified Amphipods are recorded in 

 the tables in Appendix II. 



Isopoda 

 A few Isopods were taken in the collections as follows: 

 Munnopsis sp. Isopoda alia. 



St. WS 22 . 

 St. WS 26 . 

 St. WS 69 . 



Rhabdocheirus sp. 

 St. WS 61 ... 9 at 500-250 m 



1 at 1000-750 m. 

 1 at 750-500 m. 

 1 at 1000-750 m. 



St. WS 28 

 St. WS 30 



St. WS 67 

 St. WS 114 



1 at 145-100 m. 

 1 at 250-100 m. 

 1 at 500-250 m. 

 1 at 1000-300 m. 

 1 at 1 16 m. 



