Chambers's encyclopaedia; a dictionary of universal knowledge . able that in the LowerSilurian of Scotland large erratic blocks of other crystalline rocks occur, and similar blocksare met witli in the Silurian strata of the LakeSuperior region. It is dilticult to see how suchblocks could have been transported without theagency of floating ice. See also the and ( 460 SILURID^ SILVER Sillirida. or Cat fishks, a large family tislies, inclmlecl in the oriler Physos-tonii. The skin is naked, or eriuipiied with somehoiiy scutes, never witli scales
Chambers's encyclopaedia; a dictionary of universal knowledge . able that in the LowerSilurian of Scotland large erratic blocks of other crystalline rocks occur, and similar blocksare met witli in the Silurian strata of the LakeSuperior region. It is dilticult to see how suchblocks could have been transported without theagency of floating ice. See also the and ( 460 SILURID^ SILVER Sillirida. or Cat fishks, a large family tislies, inclmlecl in the oriler Physos-tonii. The skin is naked, or eriuipiied with somehoiiy scutes, never witli scales ; the dorsal tin issliort and is occasionally absent—when present itis inserted ahove or in front of the ventrals ; thereis generally an adipose lin ; the maxilla is verysmall; the barbels are well developed. The familyis represented in most parts of the world. InP^irope, however, there is only one Siliiroid, or Shadden {Sihiriis i/huiis), whichoccurs in some eastern and central regions— the Danube and the Elbe. In size it sometimes. 8ilurus glanis. approaches the sturgeon, and is a sluggish but veryvoracious animal, and has been the sul)joct ofmany strange stories. In North America most oftill! common cat-fishes belong to the genus Aminrus;in tropical .\merica the genus Pimeh)dus has manyrepresentatives (see C.\). In many species ofArius —a marine —common in the East Indiesand on both coasts of Central America, the maleshatch the eggs in their mouths. Species of Doras,common in South America, are remarkable for theirhabit of travelling from one pond to another. Innorthern Africa the most remarkable Siluroid isthe Electric Cat-fish, Midiij/fcnirKs elcctricun. Silver (sym. Ag; equiv. 108; sp. gr. between1047 and 10o7). This metal was one of theearliest known, and is of a peculiar copsright 1892 in beautiful white colour, by by j. b. Lippincottwhich it can be distinguished :.from all other metals or alloys, except one or
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