CHAPTER XXV.. On the Formation of Marine Aquariæ, Etc.

ON THE FORMATION OF MARINE AQUARIÆ, ETC.

Mimic oceans--Practical hints on marine aquariæ--Various tanks described--The 'gravity bubble'--Evaporated sea-water--Aquariæ in France--Sea-water a contraband article across the Channel--An aquarium on a fine summer's day--The Lettuce Ulva--Author's tank--'Excavations on a rocky shore'--Tank 'interiors'--Various centre pieces--New siphon--Aquariæ difficult to keep in hot weather--How to remove the opacity of the tank--New scheme proposed--Conclusion, 353

LIST OF ILLUSTRATIONS.

No.

FRONTISPIECE, 1

COMPOUND VORTICELLÆ, 2

"GRANNY," Sir John Dalyell's celebrated Anemone, 3

A. TROGLODYTES, 4

A. CRASSICORNIS, 5

EDIBLE CRAB, 6

EDIBLE CRAB casting its Shell (from Nature), 7

SPIDER CRAB, 8

SHORE CRAB, 9

PORCELAIN CRAB, 10

HERMIT CRAB, 11

HERMIT CRAB in Shell of Large Whelk, 12

SHIP BARNACLES, 13

ACORN BARNACLES attached to Shell of the Limpet, 14

THE LIMPET, as seen from beneath, 15

LAMINATED NEREIS, 16

COMMON MUSSEL,--Shell open, 17

COMMON MUSSEL,--Shell closed, 18

THE BERÖE, 19

FAN AMPHITRITE, 20

TEREBELLA FIGULUS, 21

TEREBELLA LITTORALIS, 22

THE SEA-MOUSE, 23

DORIS, 24

YOUNG OF DORIS, 25

EOLIS, 26

THE PHOLAS, and Valves of its Shell, 27

THE BRITTLE STAR, 28

COMMON CROSS-FISH, 29

COMMON SUN-STAR (with 14 rays), 30

PURPLE-TIPPED SEA-URCHIN, 31

PURPLE-TIPPED SEA-URCHIN, Spine of, 32

PURPLE-TIPPED SEA-URCHIN, Suckers of, 33

THE APLYSIA, or SEA-HARE, 34

TEETH of the SEA-URCHIN (two views), 35

THE SEA-CUCUMBER, 36

SERPULÆ attached to piece of rock, 37

THE SOLEN, or RAZOR FISH, 38

THE BLENNY, 39

THE VIVIPAROUS BLENNY, 40

THE SPOTTED BLENNY, or GUNNEL-FISH, 41

THE MONTAGU SUCKER-FISH (three views), 42

THE MONTAGU SUCKER-FISH, Sucker of (magnified), 43