Gatty Marine Laboratory, St. Andrews. 169 
The first segment has two touches of orange or red (without 
crystalline elements), whilst the abdomen is reddish or 
orange. 
The first region of the body consists of eight segments as 
a rule, viz., the peristomial and seven bristled segments. 
Moreover, as De St. Joseph pointed out, the first and the last 
have glandular scutes on the ventral surface, the first, im a 
line with the first bristle-tufts, being especially large. The 
first setigerous process and its bristles are usually directed 
differently from those which follow, viz., obliquely upward, 
forward, and outward, the rest being in repose placed 
obliquely upward and backward. The bristles are somewhat 
shorter than those which follow, and present more distinct, 
though very translucent and narrow wings. The typical 
anterior bristles are pale golden and highly iridescent long 
slender bristles with straight shafts and but slight curva- 
ture of the finely tapered tips, the wings being so narrow 
as to be almost indistinguishable, only a linear streak 
indicating their presence on careful mspection. Such, 
therefore, differs from the condition in P. tubularia, where 
De St. Joseph describes and figures the wings as not only 
distinct, but striated. The wings are also more distinct in 
P. intestinum from the Mediterranean. It is possible that 
friction modifies the wings in this region,and hence the more 
evident nature of those on the first bristle-bundles, which 
are less exposed. 
The posterior region differs from that in Protula intes- 
tinum, for instance, since it presents no evident bristles to 
the naked eye or under a lens, for they are usually so 
closely adpressed as to escape notice, whereas in P. intes- 
tinum the posterior region has on each side a palisade of 
long glistening bristles. Such, however, is apparently due 
to friction, since in those best preserved similar though 
smaller bristles occur in this species. 
Other tufts show only short shafts dilating gradually 
toward the distal end, which is curved, flattened, and trans- 
lucent, the slender tips of which occasionally project beyond 
the surface. 
The small variety dredged off St. Peter Port, and found 
between tide-marks at Herm, has somewhat better-developed 
wings to its bristles, and the tips of the posterior bristles 
are more clearly scimitar-shaped, being curved backward 
like Symes’s knife. In others, the straight tips ended in 
sharp points, but whether such was due to injury or mal- 
formation is not at present clear. 
The rows of hooks occur on the ventral side and behind 
