TRANSACTIONS. 253 
The seaweeds found along the shores of Dumfriesshire and 
Galloway have not, as far as I am aware, been catalogued, and 
although they are not so varied or plentiful as those on more 
exposed coasts they form a portion of the flora of the district and 
should not be overlooked. 
Seaweeds are found in greater abundance on the rocky and 
exposed coasts, in the pools of water among the rocks, and growing 
in the water when the tide is at the ebb. As there are no rocks 
along the coast of Dumfriesshire, but sand banks instead, and the 
distance to the water’s edge when the tide is out considerable, only 
a few specimens can be obtained growing in the natural state, and 
not many are to be gathered when washed ashore by storms. 
The Galloway coast differs from that of Dumfriesshire, for there 
are rocks at Douglas Hall, Colvend, and further westward, but 
these are either ofthe Silurian or Igneous formations, and are not 
so favourable to the growth of seaweeds as the softer rocks. 
In order to investigate the seaweeds of the district it is 
necessary to examine the rocks or other structures where they 
grow at all seasons of the year, and every opportunity should be 
taken to collect specimens washed ashore by spring tides and 
storms. Under these circumstances the making of a complete list 
of seaweeds is no easy task, and as the spare time at my disposal 
was limited, I have only been so fortunate as to secure some of the 
commoner species, many of which I now exhibit and briefly notice. 
Sus-Ciass I.—de/anospermew.—The seaweeds in this sub- 
class are of an olive colour and grow in abundance on every shore, 
except one genus—,Sargasswm—which covers immense tracts of the 
Atlantic in the tropics. This sub-class is divided into six orders, 
which we shall briefly notice. 
\ Fucacee.—All the plants in this order are dark olive and 
have the peculiarity of turning black when dry. The following 
are frequently met with: adidrys Siliguosa, growing in rocky 
pools, and at low water mark on the rocks at Douglas Hall and 
the Galloway coast. cus vesiculosus, common sea-wrack, grows 
on every stone washed by the tide. ; 
£. Serratus, common, is distinguished by the serrate fronds, 
no air vessels, and grows in large patches on the rocks between 
tide marks.  MNodosus, also common, generally washed ashore at 
Glencaple and Ruthwell by the tide. A number of parasitical 
species attach themselves to this plant. / Canaliculatus, a small 
