Wood.] ^^^ [June 18, 



CLASS RHODOPHYCEAE. 

 FAM. PORPHYRACEAE. 



GEN. PORPHYRIDIUM. 



p. CRiJEKTUM. (Ag) Naeg. 

 BemarJcs.—A small piece of bone was sent me by my friend, Dr. Bil- 

 lings, on which were a few specks of this little organism. The bone had 

 been picked up on Governor's Island, New York Harbor, and it is very 

 possible that it was a fresh arrival from Europe. I have never met with 

 traces of the species elsewhere. 



p. MAGNIFICXJM. Sp. NoV. 



P. cellulis globosis vel subglobosis, rare nonnihil polygonis ; cytio- 

 plasmate purpureo, granulato ; cytiodermate crasso, baud lamelloso. 



Cells globose or subglobose, rarely somewhat polygonal ; endochrome 

 purple, granulate ; cell wall thick, not laminate. 



Dram. Cell cum. tegum. ^4-|oo-2¥¥oo* Tegum. -^oho-iihs- 



Hab. In terra humida, Texas. Prof. Ravenel. 



FAM. CHANTRANSIACEAE. 



GEN. CflANTRANSIA. 



C. EXPAKSA. Sp. Nov. 



C. caespitosa, in lapide stratum saturate violaceo-purpureum lubri- 

 cum, indefinite expansum formans ; fills purpureis, modice ramosis, fere 

 2 lineas longis et ramis plerumque strictis et rectis, saepe elongatis ; 

 ramulis fertilibus brevibus, ascendentibus ; articulis diametro 3-8 plo lon- 

 gioribus, extremis obtusis; polysporis in ramellis lateralibus racemosim 

 et confertim cumulatis, ovalibus vel nonnihil obovatis. 



Caespitose, forming a dark purple, slippery, indefinite stratum on 

 • stones ; filaments purple, moderately branched, almost 2 lines long, 

 together with the branches strict and straight, often elongate ; infertile 

 branches sometimes very few, sometimes very numerous ; fertile branches 

 short, ascending ; joints 3-8 times as long as their diameter, the final 

 articles obtusely rounded : polyspores racemose, crowded on the fertile 

 branches, oval or somewhat ovate. 



Diam. Fil. ^5Vo"=-0004", Spor. transv. 3gVo"=-000271ong.3 5i^= .0004" 



Remarks. — I formerly referred this species very doubtfully to C. viola- 

 cea Ktz., but am now convinced that it is distinct. Its size, mode of 

 growth, and habit all are very different from those of that species. 



Hab. In riviilis prope Philadelphia. 



Whilst the above has been going through the press I have found float- 

 ing on a "brick pond" the following new nostochaceous plant. 



