THE ALGAE OF BERMUDA. 145 



Protoplast subcylindrical in the lower cells, subspherical in the upper, 

 marked with a pattern of delicate, longitudinal bands, seldom anasto- 

 mosing or extending the length of the cell, usually separated by spaces 

 of about their own width. Tetrasporangia ovoid, about 50 X 35 /i, 

 excluding wall about GM thick, 1-4 at a node, cruciate, sometimes 

 regularly, sometimes decussately; when singly at a node they form an 

 external longitudinal series; when more than one, they are irregularly 

 placed about the node; about half of the sporangium projecting 

 beyond the cortication. On Padina variegata, Gibbet Island, Jan. 

 16, 1913, Hervey, type in Collins herbarium, No. 7418a; also on 

 Galaxaura, Gravelly Bay, April, on various algae, Hamilton Harbor, 

 Dec., Collins. 



In habit like the following species, C. transversale, but a larger plant, 

 and distinct by the division and position of the tetraspores, and the 

 character of the cortication. Only tripartite tetraspores have been 

 recorded for any of the numerous species of Ceramium, but as other 

 characters agree, it does not seem desirable to remove it from the 

 genus. 



3. C. transversale sp. nov.; P. B.-A., No. 2049. Minuta, ad 

 alias algas saxaque repens; filamento prostrate 60-90 fj, diam., cel- 

 lulis sesqui-S diam. longis, cylindricis vel ad nodos leviter contractis, 

 rhizoidis unicellularibus, incoloratis affixis, ad nodos singulis pluri- 

 busve ortis; filamentis erectis passim ad nodos evolutis; filamenti 

 prostrati apice assurgente, in filamentum erectum transformato; 

 ramulis penultimis circa 60 /j. diam. ; filamentorum erectorum cel- 

 lulis ad 2 diarn. longis, non amplius; prope apicem diametrum 

 non aequantibus; filamentis erectis repetite dichotomis; cellulis 

 inferioribus cylindricis, superioribus adparenter brevissime clavatis, 

 causa corticationis ad apicem; corticatione a parte corticata distinctis- 

 sima, super seriem cellularum transverse elongatarum series 2 vel 

 3 cellularum rotundo-angulatarum irregulariter positarum gerente. 

 Protoplasma uniformiter granulosum vel striis tenuibus, parallelis, 

 longitudinalibus notatum per totam longitudinem cellulae; in 

 cellulis inferioribus cylindrica, in superioribus subsphaerica. Cysto- 

 carpio evoluto ad apicem segmenti 2-5-cellularis, cellulis supra in- 

 crassatis, cellula summa cellulam imam duplo plusve majore, non- 

 nullos ranios paucicellulares involucrales, cystocarpios 1-2 includentes 

 gerente; cystocarpiis adparenter terminalibus, atque axi plerumque 

 ultra cystocarpios et involucrem protenso, ex cellulas paucas constante, 

 cellula basali 2-3 diam. longa, ceteris, ut cellulis involucri, vix 1 diam. 

 Tetrasporajigiis tripartitis, ad 60 /JL diam., membrana 8 IJL crassa non 



