AND ADJACENT WATERS. 



295 



agree with Klitzing's genus Sjpor acanthus. Through the kindness 

 of the distinguished algologist, Dr. E. Bornet, I am able to say that 

 it is a form of Antithamnion crueiatum, with pentamerous whorls of 

 ultimate simple acicular branches, on which the scooped-out inter- 

 calary tetraspore-like bodies are reserve-spores according to the 

 observations of Berthold."^ Dr. Bornet sent me a plant of A. 

 crueiatum, dredged at Antibes, having both tetraspores and reserve- 

 spores. 



Drake's Island. 



The shore of the greater part of this island is not rich in weeds. 

 In the extreme south-west I found J3ryopsis phimosa growing in half 

 a dozen half-tide rock-pools — the best locality in Plymouth Sound 

 for this weed. The south-west rock-pools are fairly rich, the weeds, 

 for the most part, like those found on the north-east and east shores, 

 the more important forms being — 

 Gigartina mamillosa, in great Gracilaria confervoides. 



abundance. 



Lomentaria ovalis, ? , tetra- 

 spores. 



Chylocladia articulata. 



Chondrus crispus. 

 Porphyra. 



Dictyota dichotoma. 

 Desmarestia. 



Dredging and grappling combined showed the region north and 

 north-west of Drake's Island to be surprisingly rich in weeds, as the 

 accompanying list will indicate : 



Stenogramme interrupta, fruits, 



in abundance. 

 Dudresnaia coccinea. 

 Sphjerococcus coronopifolius. 

 Gracilaria confervoides. 

 Grifl&thsia corallina. 

 Antithamnion plumula, /3. 

 Callithamnion, several species. 

 Bonnemaisonia asparagoides. 

 Ceramium tenuissimum. 

 Sarcophyllis edulis. 

 Phyllophora membranifolia (P. 



palmettoides ?). 

 Rhodophyllis bifida, fruit. 

 Nitophyllum venulosum (N. 



thyrsorhizans of Holmes). 



N. laceratum. 



Rhodymenia laciniata. 



Chylocladia articulata. 



C. clavellosa. 



Gigartina mamillosa. 



Gelidium corneum. 



Dasya coccinea (almost every- 

 where). 



Cutleria multifida, ? . 



Dictyopteris polypodioides. 



Taenia atomaria. 



Dictyota dichotoma. 



Asperococcus compressus. 



Scytosiphon lomentarius. 



Cladostephus, Sphacelaria, Ecto- 

 carpus, Cladophora, species. 



Up to the present the different observers of fertilization in the 

 Gutleriacex have failed to observe the nucleus in the ovum. I am 



* BertboUl, U. d. Vertheilung d. Algeu, i, S. v, Neapel. 



