292 FLOEA OF PLYMOUTH SOUND 



abundance. Stenogramme interrupta, Dudresnaia coccinea, Scinaia 

 furcellata, Halymenia ligulata, were not met with behind the Break- 

 water. Near the western buoy Arthrocladia villosa was obtained in 

 quantity. In addition the following more important forms : 

 Antithamnion plumula^ |3. ' Hydrolapathum sanguineum. 



Callithamnion thuyoideum { S , ' Rhodymenia palmata, R. pal- 



tetraspores), &c. i metta, R. ciliata. 



Spondylothamnion multifida. I Phyllophora membranifolia, P. 



Chantransia virgatula. i rubens (fruit). 



Ceramium tenuissimum, fruit, Dictyopteris polypodioides (a 



tetraspores. little) . 



Nitophyllum punctatum, N. Hil- \ Striaria attenuata. 



life, N. laceratum, N. Bonne- Desmarestia aculeata, D. ligu- 



maisoni, c? • lata. 



Delesseria alata, D. ruscifolia. ' Dictyota dichotoma. 



Area enclosed hy East Winter and other Buoys in Centre of Sound. 



Here (the mud '' cakey " and a home for nemertians) the follow- 

 ing are the more important forms observed : 



Antithamnion plumula. 

 Monospora pedicellata. 

 Chrysymenia rosea. 

 Chylocladia clavellosa. 

 Lomentaria corallina. 

 N. punctatum. 



Rhodophyllis bifida. 

 Delesseria ruscifolia, D. hypo- 



glossum. 

 Phyllophora palmettoides. 

 Punctaria latifolia. 

 Desmarestia ligulata. 



The western part of the Sound, from Picklecombe Fort in the 

 south to the bridge on the Mount Edgcumbe side in the north, is 

 too dangerous for any nearer examination in the '' Firefly " than that 

 part marked out in the Admiralty chart as the regular passage to 

 the Hamoaze. The bridge itself is covered with Rhodymenia 

 palmata and Laminaria digitata, only a few other, and these com- 

 mon, forms being found. L, digitata is well exposed at low tide, 

 thus illustrating a statement of Cocks, made twenty years ago, that 

 this plant was gradually taking up a littoral position, and ceasing 

 to be met with only as an extra-tidal weed. 



North of the Bridge. 



Dredging here showed a poor flora, the strong currents, no doubt, 

 being to a very great degree accountable. It was of interest to 

 find, though as scraps only, S. ijiterrupta, Chrysymenia rosea, and 

 Dudresnaia coccinea. 



