THE OLDER STAGES 183 



Station 2603 (Fig. 19), in so far at least as the shelf or slope regions are concerned, we failed 

 because as a general rule we did not send our nets often enough close enough to the bottom. In the 

 coastal waters of Antarctica and of Antarctic islands generally the sea bed is often very rough^ and 



..oa)@®#0' 



so 



100 



250 



500 



750 



1000 



SHELF WATER 



U3 



22 



20 25 22 



— 7 



22 12 



14 13 8 



2 — 



OCEANIC WATER 



41 20 7 — 



49 44 40 



10 28 73 70 33 — 



— I II 



B 40 



Fig. 20. Developmental phases of the eggs. Diagram showing the approximate numbers and vertical distribution of the seven 

 stages recorded between the surface and 1000 m. These figures are not exact counts, for the egg stages are often indeter- 

 minate or doubtful, but they indicate the trend of depth ranges. For the eggs at St. 2594, see Fig. 22, p. 184. 



so 



100 



250 



o 



500- 



CX)00000(X)0 



OOOCX)(X)Q)Q)« 



00(D®@« 



750 



1000 



SHELF WATER 



OCEANIC WATER 



Fig. 21. Vertical distribution of developing eggs in shelf and oceanic water, the developmental phases encountered at each 

 depth interval being shown to the nearest 10%, the smaller marginal symbols indicating fractions of 10%. 



much encumbered with stones and erratic boulders, occasionally (Broch, 1951) supporting a rich and 

 jagged Hydrocoralline growth, and in order to avoid damage to the costly vertical nets through coming 

 in contact with it, it was customary to give it a wide berth, the practice in general, except when in 

 very shallow soundings (150 m. or less), being to leave a gap of 50 m. or more between the bottom and 

 1 Recent soundings by the Russian research ship ' Ob ' reveal it to be distinctly ' hillocky ' (Lisitzin and Zhivago, i960). 



