seteptad, if they ajfe rooted to tlie roeka, ttey m^iist. not be tona 

 from their aaeiioragft; the only way to preserre their lives is to 

 chip off the fragment of stone to which they are attached. 

 Therefore, when you go weed-hunting, put. a hammer and a 

 small chisel in your pocket. 



As in the. case of the fresh-water tank, it is better to allow 

 your plants time, to settle comfortably, and impregaate the 

 water with oxygen, before you introduce your animals. Aocord- 

 ding to the above-quoted authority nome are so likely to thrive 

 as the following : — 



" Fishes^ — The smaller sticklebacks ; young specimens of the 

 grey mullet, which have lived for more than three years in the- 

 Zoological Society's aquarium j the blenaies and gobies ; the 

 spotted gunnel ; the smaller wrasses ; the rookbngs ; the 

 flounder ; the dab ; and the eels. 



" Moll/mca. — The sea-hare ; the periwinkle ; the commoner 

 tops ; the purple ; the murex ;, the chitons ; the bullas ; the 

 scallops ; the muscle ; the modioles ; the anoroia ; the oyster ; 

 and some of the sand-burrowing bivalves^ as Vemms, Maetra,. 

 Ptdlasira, &o.. GasirQchcena and Saxicava, burrowers in stone, 

 may be readily kept, and are very interesting, especially the 

 former, which I have had in confinement for many months in 

 more than a single instance, and still possess. 



" Oirripedes. — The acorn bajnaole [Balarms and OMJiama- 

 his) and the interesting little Pyrgema, which la invariably 

 found cemented to the plates of our larger madrepore. 



" Crustacea. — The strawberry crab ; some of the swimming 

 crabs ; the shore orab j the eatable crab ; the hairy crab ; the 

 HhaUa ; the masked crab ; the soldier crab ; the broad-clawed 

 crab ; the shrimps ; tlie true prawns ; the Aihwnas ; ajid many 

 of the Bniomostraea. 



"ArmelMes. — The gold comb; the aabeUas; the serpulas; the 

 sea-leech ; the long worm j and the terebellas. 



" ZoopJiytes. — Most species of sea-anemone (except the thick 

 horn, Bwnodss erassicorms, which is very precarious); both 

 species of madrepore." 



The reader will see, that amoug ihe fish for the marine tajak 

 the stickleback is allowed a place, whereas in the fresh-water 

 aquarium his services were defined. It is, however, a very 

 different matter. His companions are by no means of the 

 milk-and-water stamp. T^e the goby, " a fierce little cannibail 

 fish about three inches long, that will vary the interest of the 

 BmaJl drama always going on in the aquarium by taking the 

 788 



