10. Plocamium coccineum.

11. Phylophora rubens.

12. Zostera marina.

In a few days the water, poured carefully to these specimens, became clear as pale green crystal, the green tinge being too slight to obscure the colour of any object seen through its medium.

From these weeds alone, before any supply of Zoöphytes or Molluscs were intentionally added, a whole host of minute animal life swarmed forth; some, doubtless, issuing from eggs newly hatched; others from the shelter of the matted ramifications of some of the sea-weeds, in which they had been taken, as in a net. Among these swarming creatures were Annelids of the genus Syllis, Rissoæ, and other minute shell-fish, but principally Isopodous and Entomostracous Crustacea, many of them being so minute as not to be perceived without the use of a powerful lens.

Of the animals next placed in this tank, of only two feet by one foot six inches, the following is the list given:—

FISH.
1. Fifteen, Spined SticklebackGasterosteus spinachia.
2. Seven, Gray Mullet (young)Mugil capito.
3. One, Black GobyGobious niger.
4. One, CorkwingCrenilabrus cornubicus.
5. One, Five-bearded RocklingMotella 5-cirrata.
6. One, Great Pipe-fish (young)Syngnathus acus.
7. One, Worm PipeSyngnathus lumbriformis.
SHELLS, MOLLUSCS, ETC.
1. Two, Ashy TopTrochus cinerarius.
2. One, Navel TopTrochus umbilicatus.
3. Three, Common PeriwinkleLittorina littorea.
4. Three, Yellow PeriwinkleLittorina littoralis.
5. One, PurplePurpura lapillus.
6. One, Scrobicularia.
7. One, Anomia.
8. Two, Common CockleCardium edule.
9. Two, Ascidia.
CRUSTACEA, ETC.
1. Two, Hermit CrabPagurus Bernhardus.
2. One, dittoPagurus Prideauxii.
3. Four, Sand ShrimpCragnon vulgaris.
4. One, PrawnPalæmon serratus.
5. Three, Crown WormSerpula triquetra.
6. Three, White-line WormNereis bilineata.
ZOÖPHYTES.
1. Two, Thick-horned AnemoneActinia crassicornis.
2. Three, Weymouth AnemoneActinia clavata.
3. Two, Parasitic AnemoneActinia parasitica.
4. Six, Plumose AnemoneActinia dianthus.
5. Five, Daisy AnemoneActinia bellis.

There were thus above seventy specimens, animal and vegetable, already in the tank, without counting the swarms of smaller creatures, some the young of large species, daily increasing in size; yet, our bold experimentalist, anxious to conquer his “Russia” at one grand invasion, still poured in fresh specimens. These consisted of:—

FISH.
1. One, Æquorial Pipe-fishSyngnathus æquoreus.
MOLLUSCS, CRUSTACEANS, ETC.
1. One, Rough DorisDoris pilosa.
2. Two, Magus TopTrochus magus.
3. One, NeritNatica Alderi.
4. One, SquinPecten opercularis.
5. One, PholasPholas parvæ.
6. One, PisaPisa tetraodon.
7. One, Cleanser CrabPortunus depurator.
8. One, EbaliaEbalia Pennantii.
9. One, Hermit (small)Pagurus . . . . . .
10. Three, Lobster PrawnAthanas nilescens.
STAR-FISH, ETC.
1. One, Brittle StarOphiocoma rosula.
2. One, Eyed CribellaCribella oculata.
3. Two, Scarlet Sun-StarSolaster papposa.
4. One Bird’s-foot StarPalmipes membranaceus.
5. Three, Gibbons StarletAsterina gibbosa.
6. One, Purple-tipped UrchinEchinus miliaris.
7. Seven, Scarlet MadreporeBalanophillia regia.
8. Three, Cloak AnemoneAdamsia palliata.

These additions brought the collection up to above a hundred specimens, and no doubt the tank made a glorious show; but Mr. Gosse, though the Napoleon of his specialty, was forced to acknowledge that there was an “impossible.” Although his collection was superb, and his interesting tank did not look over-crowded, yet he soon discovered that a forbidden limit had been passed, and that the creatures of the ocean that have yards—fathoms—of their native element to their own separate share, cannot accommodate themselves to the allotment system, in the proportion of a square inch to each individual.