AND ADJACENT WATERS. 303 



Porphyra. Asperococcus. 



Mesoglcea (in plenty). 



On a calm day one can see the bottom of the sea^ even to tlio 

 recognition of particular weeds, in many places in Wembury Bay, 

 north and east of the Mewstone. Circumstances prevented me from 

 carrying out an intention of using the dredge or grapples in these 

 places. Dredging half a mile south of the Mewstone, in seven to nine 

 fathoms, 200 — 400 yards east of the Black Buoy, revealed the rare 

 (British) weed Dictyo'pteris polypodioides in great abundance, with 

 tetraspores, ? and ^ organs. I read a paper on this genus before 

 the Linnsean Society in December last, in which paper the results of 

 my examination of this Plymouth material were incorporated. I 

 was able to show that the Dictyotaceai are true Phseophycese, and 

 that they fall into a series in which Reinke's Tilopteridese, of which 

 the Plymouth representative is Tilopteris Mertensii, are included. 

 Other weeds dredged here were — 

 Rytiphlasa fruticulosa. Gracilaria confervoides. 



Scinaia furcellata. 

 Bonnemaisonia. 

 Schizymenia. 

 Ehodymenia jubata. 

 Corallina rubens. 



Delesseria sinuosa. 

 Gelidium corneum. 

 Cutleria multifida. 

 Sporochnus pedunculatus. 

 Taonia, Dictyota, Cladostephus. 



Mouth of the Yealm River. 



Dredging in the Yealm in three to six fathoms, off the Coast- 

 guard Station and close in, furnished a locality for Gracilaria multi- 

 partita {G. polycarpa), HaJymenia ligulata, Scinaia furcellata, 

 Dudresnaia coccinea (all in abundance). The following were also 

 dredged : 



Spyridia filamentosa, 

 Gracilaria confervoides, 



Asperococcus bullosus, 

 Sporochnus pedunculatus. 



and species of Monospora, Antithamnion, Spondylothamnion, Deles- 

 seria, Nitophyllum, Rhodophyllis, Gymnogongrus, Chylocladia, 

 Ceramium, Ectocarpus, &c. 



The Breakwater. 



I was prevented from examining the Breakwater at all fully. On 

 the inner side the boulders, &c., were seen, at low spring' tide, 

 covered with Fucvs, Ozothallia, Laminaria, Halidrys, growing 

 amongst which were Giga^'tina mamilla^a, species of Callith amnion, 

 including C. seirospermuin, Ceramium, Chylocladia, Plocamium, 



