THE APLYSIA, OR SEA-HARE. Anecdote--The Sea Hare plentiful at North Berwick--Its powers of ejecting a purple fluid at certain times--Sea Hares abhorred by the ancients--Professor Forbes--Spawn of the Aplysia, 307 CHAPTER XXII. SERPULÆ AND SABELLÆ. Tubes of the _Serpulæ_--Dr. Darwin--The harbour of Pernambuco--Its wonderful structure--Reproduction of the _Serpulæ_--_Sabellæ_--Their sandy tubes, &c., 313 CHAPTER XXIII. THE SOLEN, OR RAZOR FISH. How it burrows in the sand--How specimens are caught--_Cum grano salis_--Bamboozling the Spout Fish--Amateur naturalists, and fishermen at the sea-shore, 321 CHAPTER XXIV. A GOSSIP ON FISHES--INCLUDING THE ROCKLING, SMOOTH BLENNY, GUNNEL FISH, GOBY, ETC. Punch's address to the ocean--Old blue-jackets and the 'galyant' Nelson--The ocean and its inhabitants--Life beneath the wave--Fishes the happiest of created things--A fishy discourse by St. Antony of Padua--Traveller's ne'er do lie?--The veracious Abon-el-Cassim--Do fishes possess the sense of hearing--Author's experience--An intelligent Pike fish--Dr. Warwick--The Blenny in its native haunts--A 'Little Dombey' fish--Anecdote--The Viviparous Blenny--The Gunnel fish--Five-bearded Rockling--Two-spotted Goby--Diminutive Sucker-fish--Montagu's Sucker--The Stickleback--Its nest-building habits described--Conclusion, 327 CHAPTER XXV. 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