192 Part IIT — Twenty-first Annual Report 
DEEP WATER. Moray Firth AND ABERDEEN Bay. 
Cm. 
May- | June- |} July- 
June. | July. Aug. Sept. Nov. Dec. 
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In most cases, owing to the paucity of specimens, the distinction 
between the groups is not very sharp, even when grouped in ‘5 em. and 
eraphically exhibited, but still it appears fairly certain that there are three 
annual series or generations represented in the Table. Taking the first 
series in November. it begins at 127 mm. and extends apparently to 
