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JOTTINGS—BUCCINUM UNDATUM, LINN. 81 
would be if the walls of its tenement should supply the animal 
with food. 
These two species may not be the only ones that use the plant 
in this way. I have found similar but more superficial and widely- 
spread furrows, both on the stems and the fronds, which were 
probably produced by others of the amphipod family. The scars 
of Helcion pellucidum are frequently met with on the stems of 
Laminaria, but their shape generally resembles the form of the 
shell. 
Laminaria bulbosa has not come so much under my notice, as 
the stems are mostly free from algal parasites, whereas those of 
Laminaria digitata ave often well-covered with various kinds of 
sea-weeds. I have never observed these furrows on the latter 
plant, which may not be so agreeable to the taste of the amphipods 
as are the stems of Laminaria bulbosa. 
Buccrnum uNnpDATUM, Linn. 
[Read.20th June, 1893.] 
The egg-cases of this species may sometimes be found attached 
to stones at or near low water, and are not unfrequently cast 
ashore by the tide. They usually occur in masses or lumps about 
the size of a hen’s egg, round on the top, with a flat base of 
attachment. Each of the cells composing the lump is a little 
larger than a full-sized garden-pea, and they very much resemble 
the combs formed by the wild bee (Bombus muscorum). At the 
shore it is not unusual to meet with two or three of these single 
lumps of cells attached together so as to form a still larger cluster, 
one of the lumps being generally larger than the shell of the 
adult animal itself. 
The very large cluster under notice was taken in the trawl 
_ between Millport and Little Cumbrae, in 20 fathoms of water. 
When we compare the animal with the lumps of egg-cases, we may 
find it difficult to believe that more than two or three of these 
compound clusters can be the product of a single Buccinum ; but 
when we come to twenty or thirty lumps clustered together, we 
are forced to conclude, in the absence of other proof, that each 
