WHORL. The spiral turn of a univalve shell.
XIPHOSURA (Gr. _xiphos_, a sworn; and _oura_, tail). An order of
_Crustacea_, comprising the _Limuli_ or King-Crabs, characterised
by their long sword-like tails.
XYLOBIUS (Gr. _xulon_, wood; _bios_, life). An extinct genus of
Myriapods, named in allusion to the fact that the animal lived
on decaying wood.
ZAPHRENTIS (proper name). A genus of Rugose Corals.
ZEUGLODONTIDAE. (Gr. _zeugle_, a yoke; _odous_, a tooth). An extinct
family of Cetaceans, in which the molar teeth are two-fanged,
and look as if composed of two parts united by a neck.
ZOOPHYTE (Gr. _zooen_, animal; _phuton_, plant). Loosely applied
to many plant-like animals, such as Sponges, Corals, Sea-anemones,
Sea-mats, &c.
INDEX.
Acadian Group.
_Acer_.
_Acervularia_.
_Acidaspis_.
Acorn-shells.
_Acroculia_.
_Acrodus; nobilis_.
_Acrotreta_.
_Acroura_.
_Actinocrinus_.
_AEglina_.
_AEpiornis_.
_Agnostus; rex_.
_Alces malchis_.
_Alecto_.
_Alethopteris_.
_Algoe_ (_see_ Sea-weeds).
Alligators.
_Alnus_.
_Amblypterus; macropterus_.
_Ambonychia_.
_Ammonites; Humpresianus; bifrons_.
_Ammonitidoe_.
_Amphibia_; of the Carboniferous; of the Permian; of the Trias;
of the Jurassic; of the Miocene.
_Amphicyon_.
_Amphilestes_.
_Amphispongia_.
_Amphistegina_.
_Amphitherium; Prevostii_.
Pages:
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604