INVERTEBRATE ANIMALS. 67 
but where there is any difficulty, it must be left to the ingenuity 
_ of the operator. 
Those travellers who do not wish to take the trouble of 
skinning fishes themselves, should preserve them in barrels of 
spirits. Each should be wrapped up in a separate piece of 
cloth, to prevent their scales being rubbed off by friction. 
When travellers intend to preserve fish in spirits, they ought 
to provide themselves with casks of from four to ten gallons, 
_ well bound with iron hoops. An opening is cut near the bung- 
hole, of the dimensions of six inches by four, of this shape u. 
The piece of wood cut out must be so bevelled, outwardly, that it 
cannot fall into the cask, and must be used as a stopper, when 
_ the barrel has been filled with specimens. The fish put in 
should each be numbered with a small leaden ticket, or piece 
of wood, with the number turned or cut out, and corresponding 
notes taken of its locality, whether male or female, and of its 
name, if known, or the provincial name of the country, with any | 
other circumstance connected with its history which can be 
procured. When the barrel is filled, the stopper must be put 
in, and hermetically sealed, to prevent the evaporation of the 
liquor. 
If a female is procured, much swollen with spawn, an opening | 
must be made at the anus, and the spawn extracted by it. — 
_ The liquor must not be too strong, otherwise it will injure the | 
colours of the fish. See the strength mentioned in the receipts. 
DIVISION II.—INVERTEBRATE ANIMALS. 
CLASS I.—MOLLUSCA. 
This class contains all the animals which are soft, and des- 
titute of a spine; namely, Cuttle Fish, Univalve and Bivalve 
Shells, Turbinated Animals, and the Cirrhipeda. 
CurrLe Fisu, and all other Mulluscous animals, can only 
_ be preserved in spirits. The same observation applies to the 
_ animals which inhabit that numerous tribe called Testaceous 
Shells. They must be detached from the shells, and put into 
_ spirits, while the shells themseives must be preserved, unie- | 
pendent of the animal. 
