PART FIRST, 



LIST OF THE CONTENTS 



OF EACH TANK. 



The Aquarium contains only marine animals and plants. 

 . All have been found in the bay of Naples. 



In the ensuing list only the most remarkable of the 

 animals and plants are mentioned; the description given is 

 purposely couched in colloquial language, being designed 

 to convey, if possible, in a few words a sufficient impres- 

 sion of the animal to lead to its identification. The 

 asterisk (*) before a name signifies that the animal does 

 not occur at all seasons of the year. 



The ascending streams of silvery bubbles in the tanks 

 are the air drawn in by the sea- water, which is always 

 being pumped in from dark tanks under the aquarium. 

 Those animals and plants which are found near the upper 

 part of a tank, will be seen double, owing to the reflec- 

 tion against the surface of the water. All the tanks, but 

 especially, perhaps, Nos. 1, 3, 9, and 20, gain enormously 

 by being seen in the sunlight between 12 and 2 o'clock. 



On the walls of most tanks will be seen the white 

 tubes of Ciona (compare tank 4), the colonies of Botryllus 

 (p. 85) and other Compound Ascidians, and a little white 

 Sponge (p. 55, fig. 159). These grow and breed in the water 

 of the aquarium, attaching themselves to all suitable sur- 

 faces. In most tanks are swarms of tiny, reddish-brown 

 Opossum-shrimps (p. 74 . - In comparing the Fishes with 

 the figures in the Guide, it must be remembered that in 

 many species the dorsal fin nearest the head is not visible ex- 

 cept when erected (often for defence): notice, as an example. 

 Labraoc (fig. 55) in tank 10. The visitor must not rashly 

 ascribe the power of walking about to Sponges, Tunicates, 



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