OHAFTEE Xs ; 



PLANTS FOR THE MARINE TANK. 



Difference between Marine and Fresh-water Vegetation— Green Algx best for the 

 Aquarium — Danger of using olive-colored Alga: — Ulva latissima — Monster Fronds 



Action of Sun on tlie Ulva — Ulva lactuca — Ulva linza — Plants on Snail's 



backs — Knteromorpha compressa— Tlie Ocean Grove — K. intestinalis — Bryopslfl 

 plumosa — Cladophora arcta — C. rupestris — Diatomaceie — Four Plants growing one 

 on another — Codium tomentosum — Porphyra laeiniata — Grinnella Americana — 

 I'tilota elegans — Cliondrus crispus — 1'adina povonia— Desmarestia, etc. 



Nothing distinguishes the marine and fresh-water tanks 

 in appearance more than the vegetation contained in 

 them ; for instance, in the large fronds of the bright 

 green Ulva, the pink Grinndtia, the purple Porphyra, 

 and the many and brilliant colored Padvna, when com- 

 pared with the differently tinted but always green color 

 of the fresh-water plants. Then, whilst the fresh-water 

 plants may generally be torn up, either with or without 

 roots, and seem to flourish, the marine alga}, when de- 

 tached from stones and rocks upon which they grow, 

 mostly perish — requiring us, therefore, either to choose 

 those that are fixed to small portions of stone or, with 

 a hammer and chisel, chip off from the larger rocks 

 small pieces bearing such of the alga) as we think will 

 grow in our Aquarium. Still, all the sea-weeds, as they 



