332 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
and on the east from the British Islands to the Cape of 
Good Hope. It is also found on the shores of the 
Mediterranean and Adriatic. Harvey (Ner. Bor. Amer., 
ITI., p. 29, and Phyc. Brit., vol. IV.), however, considers 
it to have ‘a much wider range, by including under the 
species forms which are by other authors, and amongst 
these Agardh, ranked as distinct species. If we accept 
Harvey’s view, then its distribution would be “all the 
shores of Europe, both Mediterranean and Atlantic. 
Dispersed also throughout the temperate and torrid por- 
tions of the Atlantic, Pacific, and Indian Oceans. New 
Holland and Tasmania. Auckland Islands.” 
Locally, so far as we have been able to find out, Codiwm 
tomentosum has been recorded from one situation only, 
namely, the south end of the Isle of Man. It occurs in 
shallow rock pools at or near low water mark, at Port 
Erin and at Fleswick Bay. From these regions our 
material was obtained fresh, and kept growing in salt- 
water tanks in the Laboratory. The plants are per- 
ennials, and fruit freely (at all events, in these localities) 
in winter. The time for fruiting is generally given as 
November. Plants sent to us in February had abundant 
fruit. We have not as yet had the opportunity of exam- 
ining material collected at any other period of the year. 
Most of the sporangia had shed their contents by March. 
GENERAL MORPHOLOGY. 
Plants of Codiwm tomentosum most commonly grow in — 
more or less dense clusters, arising from a basal expansion 
which is intimately connected with and attached to the 
substratum, rock, sand, or broken shell débris (Pl. L., fig. 
1). The erect shoots are branched and cylindrical. The 
branching is usually dichotomous but occasionally mono- 
podial. The branches vary in thickness, but in a well 
