DISTRIBUTION AND GENERAL NOTES ON THE SPECIES 263 



dumbbell-shaped distribution shown in Fig. 18. It is probable that this is caused by a migration to 

 deeper water with increasing size (and age), but our data are too few to demonstrate this clearly. 

 A more pronounced depth relation of the same type shown by R. brachyurops, a more common species 

 presently to be discussed, is almost certainly due to this cause, and when plotted in similar fashion 

 shows a more sharply angled polygon of the same basic type. R. macloviana was taken only in the 

 ' Trawl + accessory nets', never in 'Other gear': 



WS80 

 WS87 

 WS9S 

 WS109 



WS217 

 WS218 

 WS225 

 WS236 



3 

 4 

 4 

 3 



WS24S 

 WS813 

 WS817A 

 WS817B 



I 

 I 

 I 

 2 



Of twenty-two specimens ten were males and twelve females; sex ratio 45-4% SS- 



Fig. 10. Distribution of i?.;a«ac/o..a„«. Spring: diamonds; summer: circles; autunm:tria^^^^^^^^ 

 squares; negative obser;ations left blank. Note. Symbols here refer to seasons, and not to surveys. 



Raja magellanica Steindachner. All our captures of this species were made in ^hej-terrneto^^^^^ 

 southern regions, and all but two of them definitely on the shelf. The spatial distribution is shown 



