Gatty Marine Laboratory, St. Andrews. 139 
separating the widened and more boldly serrated base from 
the more minutely serrated terminal region. The structure 
of those with the gap, however, does not differ from that of 
the Plymouth form. The buds presented a similar con- 
dition, and the serrations of the basal region of the tip were 
bolder than the distal. In some of the unaltered tips slight 
hollows at the site of the gap indicated a change. Further, 
in addition to the foregoing, a series of simple tapering 
bristles without evident wing were present. 
Off the Hebrides. 
Two well-developed opercula of a flattened finger-nait 
shape. Series of rounded eye-specks. No enlargement of 
the terminal processes of the branchial filaments ; long body ; 
eight pairs of anterior bristles. Collar-bristles apparently 
agreed with the St. Andrews form. 
S.E. of the Isle of May. August. 382 fathoms. 
Two opercula, circular and rather small. No enlargement 
of the tips of the branchial filaments, and the pinnze compara— 
tively short. Ova in some with comparatively short bodies. 
Collar-bristles apparently similar to those from St. Andrews. 
Shetland. 
Two opereula (small and round) in some, others have 
none. The examples are small. Collar-bristles similar te 
those from St. Ancrews. 
Moray Frith (dredged). 
Well-formed thin opereula. In another none. No 
enlargement of the tips of the branchial filaments in either. 
The collar-bristles in these forms agree with those from 
St. Andrews. 
Aberdeen Bay. August. 
Well-marked opercula in all. No enlargement at the tips 
of the branchial filaments. Collar-bristles indistinct, but 
apparently agreeing with those from St. Andrews. 
H.M.S., ‘ Triton’ and ‘ Knight Errant” 530 and 87 fms. 
An operculum is present in these as a rule, but it isa 
very thin circular plate—so thin as to be distinguished with 
difficulty in certain examples. No eggs, sperms, buds, or 
larvee were seen in these specimens in August. Numerous 
coccoliths occurred in their stomachs. The specimens from 
both ships had exactly the same structure in the collar- 
bristles as at St. Andrews. 
