Gatty Marine Labdratory, St. Andrews. 143 
usual, then a gap occurs, after which the distal finely serrated 
wing tapers to a slender point. These bristles are more 
minute than any hitherto examined. 
Norway. 
These have large branchiz, no opercula, and the tips of 
the filaments are comparatively short, not expanded, whilst 
the pinuee are numerous. No sperms were seen, but ova 
occurred in the anterior region of the abdomen. ‘There 
were seven pairs of thoracic bristles. Here then was a 
variation from the form described by Sars which had two 
opercula, The structure of the collar-bristles entirely agrees 
with that of the St. Andrews examples. 
Naples. (Salmacina edificatriz, auct.) 
‘he comparatively larze size of these examples and the 
great development of the branchie, their glandular swellings 
along the filaments, and the large size of the sausage-like 
tips, as well as the common occurrence of nine pairs of 
anterior bristle-bund!es make them conspicuous. The pine 
also take on the tendency to increase at the tips, e<pecially 
the distal pinnee, yet these pinnze are not so long as in 
ertain forms from the North Sea, also devoid of an oper- 
culum. ‘The development of the axis or filament of each 
branchia is in contrast with the smaller parts in the northern 
seas, the glands of the filaments being smaller. The points 
or main fangs of the minute hooks appear to be directed 
forward—both in the anterior and the posterior regions. 
So far as can be seen, the sperms occur behind the bare 
segments of the anterior part of the posterior region, and in 
one with embryos they seem to pass backward, some being 
present at each side of the tail: In this example (with 
embryos and ova) the tips of the branchia showed rather less 
than the usual enlargements. The granular masses at the 
sides of the tail, however, may be sperms. Yet they 
resemble the granules in front. In those with advanced 
embryos most of the sperms appear to be shed. 
The collar-bristles agree in structure with those from 
Plymouth and the north, having a basal division of the wing 
with numerous serrations, a gap, and a tapering disiai 
region with a minutely serrated edge. The bristle has the 
same curvature at the end of the shaft. Ten points at least 
appear in a favourable view of the basal web of the collar- 
bristles and the others agree with those of the northern types. 
Dongonab, Red Sea. 2.12.1915. 
The vermidom is of the open pattern, so that aeration 
