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 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. With the de- 

 scriptions of the figures are given the references to the pages in the 

 second part of the guide, where they are dealt with more fully. 



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 reflection against the surface of the water. 

 All the tanks, especially, perhaps, Nos. i, 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. 99) and 

 other Compound Ascidians, and a little white Sponge (p. 63, 

 These 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. d>j). — 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 

 except when erected (often for defence); notice, as an example, 

 Labrax (fig. 54) in tank 10. — The visitor must not rashly ascribe 

 the power of walking about to Sponges, Tunicates, Anemones, 

 etc., which he may find moving among the rocks in various tanks. 

 After seeing tank 23 he will be prepared to trace such vagaries to 

 the little crab which is their cause. 



The numbers are written in red charactres above the tanks. 



