 | Society for the diffusion of useful knowledge - 1840 - 508 Seiten
...through the most dense crustaceous coverings, or even shells of a moderate thickness. The extremity of the upper mandible is sharppointed, and solid to...sides of a thin layer of the black horny substance, and thus a combination of tough with dense matter is obtained, which much diminishes the liability... | |
 | Richard Owen - 1843 - 440 Seiten
...not less than as instruments of prehension. section of tentacle, Nautilus. The calcareous extremity of the upper mandible is sharp-pointed and solid to the extent of five lines. The lower mandible is sheathed with a thinner layer of the hard white substance, which forms a dentated... | |
 | Richard Owen - 1855 - 1196 Seiten
...organs of exploration ¡S not less than as instruments of ¿. prehension. 216 The calcareous extremity of the upper mandible is sharp-pointed and solid to the extent of five lines. The lower mandible is sheathed with a thinner layer of the hard white substance, which forms a dentated... | |
 | Henry Woodward - 1916 - 664 Seiten
...extremities of both mandibles are of a hardness apparently adequate to break through the densest crustacean coverings, or even shells of moderate thickness. That...sides of a thin layer of the black horny substance and thus a combination of tough with dense matter is obtained, which much diminishes the liability... | |
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coverings, or even shells of moderate thickness. That of the upper mandible is sharp-pointed, and solid to the extent of five lines from the extremity; but in the lower one the calcareous matter is deposited on both sides of a thin layer of the black... 