USES — MONETARY AND DECORATIVE. 
431 
Barbel, Roach, Rudd, Chub, Grayling, Gudgeon, Bream, Perch, and 
Burbot all feed upon aquatic mollusks. 
As Bait, Anodon, TJnio and Vivipara are much used by fishermen, 
Unio margaritifer especially being so employed, many boat loads 
being said to be taken from the mouth of the Ythen, near Aberdeen, 
and employed in the Cod and Ling fishery ; the use of Dreissensia, 
as bait for Perch, by an angler led to the discovery of its existence in 
this country ; while the larger Limncece are successfully used for bait 
by the Leicestershire anglers. 
As Money, certain shells, either in their natural state or worked into 
particular shapes and strung together, forming Wampum, have been 
almost universally used as money or as a medium for barter by all 
savage and barbarous races, and although marine species are almost 
invariably used for the purpose, yet Wampum was formerly made 
from the shells of the Unlonidte by the Indians of New Brunswick, 
Canada, and Achatina monetaria is similarly used by the natives 
of Benguela. 
For Decorative purposes or for personal ornamentation the Pearl 
is “par excellence” the most prized object furnished by the mollusca, 
yet the shells themselves, wholly or in part of many marine species, 
Fig. 7A3. — Heliciclian necklace, made by the peasantry of Donegal, and composed solely of H elix 
nemoratis^ reduced to one-fourth natural size (Mr. R. Welch's collection). 
are much used by savage tribes for the same purpose, their brilliancy 
and attractiveness being so superior to that of the non-marine forms, 
which are, however, occasionally used for personal decoration, as in 
South America, where the aborigines use the shells of Ampullaria, 
Orthaliciis, Lahyrinthus BuUmidiis for ornamenting the elaborate 
