518 MARINE ALGiE FOUND AT BRIGHTON. {May, 



In size Codium bursa varies considerably. Some specimens 

 are not larger than a nut, others are so large that one found by 

 Mr. Pike, when folded, covered his head, and hung down his 

 back lilvc a " sou'-wester." 



The following list of Algae has been drawn up in accordance 

 with Professor Harvey's last arrangement, as set forth in Mrs. 

 Gatty's new work, before referred to. Some genera, such as 

 Ceramium, Cladophora, and Ulva, appear to be still unsettled. 

 It is to be hoped that this classification will be final. The 

 changes that are perpetually occurring in botanical arrangement 

 and nomenclature are most puzzling to the student, who has no 

 sooner made himself master of one system of classification than 

 he has to unlearn that, and to learn another. 



LIST OF MAEINE KLGrM FOUND AT BEIGHTON, AND IN 

 THE VICINITY. 



Explanation of Symbols. — 1. Single specimens only. ! Common. ! ! Very 

 common. R. Rare. R R. Very rare, f Found growing. 



Melanospeeme^. 



Halidrys siliquosa ! ! ! 



Cystoseira granulata. February to April, occasionally found. 



Cystoseira foeniculacea. October to end of June, occasionally found. 



Cystoseira fibrosa. Principally during winter. 



Fucus vesiculosus ! f 



Fucus vesiculosus, var. j3. spiralis. 



Fucus cei'anoides R. Sometimes witb tips of fronds inflated. 



Fucus serratus ! f- 



Fucodium nodosum ! 



Fucodium canaliculatum R. 



Himantlialia lorea ! 



Desmarestia ligulata R. 



Desmarestia aculeata ! ! Note. — Students should be aware that the feathery fila- 

 ments of this and some other plants of this series owe their green colour to 

 decomposition. Their true colour is citrine. 



Desmarestia viridis ! 



Arthocladia villosa ! In some seasons, as in 1861, at others rare. 



Sporochnus pedunculatus. Same. 



Laminaria digitata ! ! ! f. 



Laminaria saccharina ! ! ! f- I gatliered at Black Rock a remarkable form of this 

 plant, with another frond growing along the centre, thus becoming trila- 

 minate. 



Laminaria Phyllitis ! f- In some seasons. 



Chorda filum ! ! ! f . More fi*equently washed ashore. 



Chorda lomentaria. 



Cutleria multifida R. 



Taenia atomaria ! t- 



