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 ani- 

 mals and plants are mentioned ; the description given is pur- 

 posely couched in colloquial language , being designed to 

 convey, if possible, in a few Avords a sufficient impression 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 sti'eams of silvery bubbles in the tanks 

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

 pumped in from dark tanks under the atiuarium. Those ani- 

 mals and plants which are found near the upper part of a 

 tank, will be seen double, owing to the reflection 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 Jh)fri/Hus ip. 85) 

 and other Compound Ascidians , and a little while Sponge 

 (p. 55, fig. 1.50). Those grow and breed in the water of the 

 aquarium , attaching themselves to all suitable surfaces. In 

 most tanks are swarms of tiny, reddish-brown Opossum-shrimps 

 (p. '74). — In comparing tiie Fishes with the figures in the 

 (iuide, it must be remembered that in many species the dorsal 

 fin nearest the head is not visible except when erected (often 

 for defence; : notice, as an example, Labrnj- [tig. 55) in tank 

 10. — The visitor must not rashly ascribe the power of Avalking 

 about to Sponges, Tunicates, Anemones, etc. , which he may 

 find moving among the rocks in various tanks. After seeing 



