156 DISCOVERY REPORTS 



A few specimens of this species were taken by the ' Terra Nova n through holes in the 

 ice off Cape Evans 76-78 S. 



Dreponopus pectinatus, Brady. The complete record of its occurrence is tabulated in 

 Appendix II. Except for two specimens taken at St. 160 it was confined to the waters 

 immediately surrounding South Georgia, where it occurred over the continental shelf 

 in very large numbers. It was particularly abundant close against the coast and com- 

 paratively scarce at the stations beyond the edge of the shelf. The maximum number 

 taken per 50 m. haul with the N 70 V net was 62,600, a number greatly exceeded by a 

 horizontal haul with the same net (N 70 H) at the surface at St. 42, when 280,000 were 

 taken per 50 m. tow. Its distribution as found in the December-January survey, 1926-7, 

 round South Georgia is shown in Fig. 73, but significance must only be attached to 

 corroborative evidence from groups of stations and to very large differences in numbers, 

 because it is so very "patchy " in its occurrence. At the "control " St. 41 (see p. 265) the 

 maximum number per 50 m. haul was 2832, and the minimum number 651. It cannot 

 be said to be more abundant on one coast than another. 



Owing to its patchiness in distribution it would be unwise to attempt to draw con- 

 clusions as to its seasonal occurrence from the slender data available. It was all but 

 absent from the five stations (C line) taken in May 1 927, only eight specimens being taken 

 at St. WS 113; but this may be of little significance since it was completely absent from 

 a similar line of stations in March 1926, yet 18,000 were recorded from a station in the 

 same month a little distance away (St. 30). 



Its vertical distribution round South Georgia is shown in Fig. 74; see also Fig. 56. 

 It rarely occurred at depths below 250 m. It showed a marked vertical migration which 

 is discussed together with that of other forms on p. 236. 



It is interesting that this species, so abundant at South Georgia, does not appear to 

 have been recorded in the Antarctic Zone before. 



Spinocalanus abyssalis, var . pygmacus , Farran. This species only occurred in the deep 

 water of the intermediate layer, or at St. 138 possibly extending into the cold bottom 

 layer below 1500 m. 



St. 129 22 at 950-780111. St. WS 30 ... 6? at 750-500111. 



St. 138 25 at 2000-1000 m. 



1 Farran (1929). 



