observed. The colour is a deep purplish brown-red, growing darker in 

 drying. The substance is firmly membranous and rigid, but thin, and 

 in drying the frond does not adhere to paper. 



A well marked species of Amansia, with a cellular arrange- 

 ment, quite unlike that of any other Alga with which I am 

 acquainted. In others of the genus, the cells in each successive 

 longitudinal row are similar in length and breadth; but here, 

 we have first a band of cells proceeding from midrib to margin, 

 with the longest cell next the midrib, and the rest gradually 

 shorter to the margin ; and following it, we have a band of cells 

 commencing at the midrib, with a very short cell, and the rest 

 gradually longer towards the margin. No fruit has yet been 

 seen, but the genus can hardly be considered doubtful on that 

 account. 



Of the many specimens found, every one was completely 

 covered on the under surface by a species of Memhranipora, 

 which, on being submitted to Mr. Busk, received from him the 

 foUowing name and character : — 



M. DELiCATissiMA (Busk) ; luermis, cellulis oblongis seu subpT/riformibus 

 membranaceis, tnargine tenui lavi, orijicio semiorbiculari, labio iriferiori 

 jorominente. Busk, in litt. 



Fig. 1. — Amansia PINNATIFIDA, — the natural size. 2. Small portion of the 

 frond, showing inflexed ma?'gin and involute apices. 3. Fragment of the 

 same, to show the arrangement of the cellular tissue. 4. Some of the 

 seriated cellules : — variously maguijied. 



