516 MARINE ALG^ FOUND AT BRIGHTON. [May, 



short. Mrs. Gatty's work contains a notice of a barren speci- 

 men of Dasya found by Miss Mary Catlow at St. Aubyn's Bay, 

 Jersey, 1858, which, as Dr. Harvey thinks it may prove a dis- 

 tinct species, has been named provisionally D. Cattlovia. Mrs. 

 Gatty mentions that externally it bears some likeness to the 

 Australian species D. Gunniana ; but that its characters come 

 nearest to D.punicea, though it is a more robust plant. As the 

 specimen found by Miss Catlow was not in fruit, its identity 

 with our plant could not be proved. 



The other plant referred to is a Phyllophora, which Dr. 

 Harvey thinks is a well-marked variety of P. rubens, if not a 

 distinct species. The Professor suggests that intermediate spe- 

 cimens should be sought for. At present there are scarcely suf- 

 ficient data to settle the question. The new variety has the 

 midrib like that of P. rubens, which it also resembles in both 

 kinds of fruit, and in colour. 



The general outline of the frond is fan-shaped, but it is sub- 

 ject to many variations. Some specimens bear a close resem- 

 blance to Rhodymenia palmata, for which it might, when not in 

 fruit, be mistaken, were it not for the constant presence of the 

 midrib. Some fronds are finely laciniated, others are broadly 

 fan-shaped, but more or less laciniated at the margin. Others, 

 again, have the crisped margin of Rhodophyllis bifida var. mar- 

 ginifera, and of some specimens of P. membranifolia. 



Like P. rubens, the new plant is frequently prolific fi'om the 

 upper end of the midrib, never from the extremity of the frond. 



The prettiest and best-marked specimens occur in the summer 

 (I think not earlier than August) and in the autumn. They 

 are cast ashore after gales. Later in the year P. rubens begins 

 to appear, though sparingly, and some of the specimens found 

 seem to present a mixed appearance, though they may generally 

 be ascribed to P. rubens. From January to March, the normal 

 form of the last-named plant abounds in full luxuriance. 



I shall conclude these observations with a few remarks on that 

 curious plant Codium bursa. 



CoDiuM BURSA is most common here in the autumnal and 

 winter months, from September to March. I have, however, 

 found it in every month except June and July. 



The specimens are generally washed ashore after storms. 

 During the heavy gales which prevailed from the 26th to the 



