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CYRTOCERAS (Gr. _kurtos_. crooked; _keras_, horn). A genus of Tetrabranchiate Cephalopods.
CYSTIPHYLLUM (Gr. _kustis_, a bladder; _phullon_, a leaf). A genus of Rugose Corals.
CYSTOIDEA (Gr. _kustis_, a bladder; _eidos_, form). The "Globe-crinoids," an extinct order of _Echinodermata_.
DADOXYLON (Gr. _dadion_, a torch; _xulon_, wood). An extinct genus of Coniferous trees.
DECAPODA (Gr. _deka_, ten; _podes_, feet). The division of _Crustacea_ which have ten feet; also the family of Cuttle-fishes, in which there are ten arms or cephalic processes.
DECIDUOUS (Lat. _decido_, I fall off). Applied to parts which fall off or are shed during the life of the animal.
DEINOSAURIA (Gr. _deinos_, terrible; _saura_, lizard). An extinct order of Reptiles.
DEINOTHERIUM (Gr. _deinos_, terrible; _therion_, beast). An extinct genus of Proboscidean Mammals.
DENDROGRAPTUS (Gr. _dendron_, tree; _grapho_, I write). A genus of Graptolites.
DESMIDIae. Minute fresh-water plants, of a green colour, without a siliceous epidermis.
DIATOMACEae (Gr. _diatemno_, I sever). An order of minute plants which are provided with siliceous envelopes.
DIBRANCHIATA (Gr. _dis_; twice; _bragchia_, gill). The order of _Cephalopoda_ (comprising the Cuttle-fishes, &c.) in which only two gills are present.
DICERAS (Gr. _dis_, twice; _keras_, horn). An extinct genus of Bivalve Molluscs.
DICTYONEMA (Gr. _diktuon_, a net; _nema_, thread). An extinct genus of _Polyzoa_.
DICYNODONTIA (Gr. _dis_, twice; _kuon_, dog; _odous_, tooth).
An extinct order of Reptiles.
DIDYMOGRAPTUS (Gr. _didumos_, twin; _grapho_, I write). A genus of Graptolites.
DIMORPHODON (Gr. _dis_, twice; _morphe_, shape; _oduos_, tooth).
A genus of Pterosaurian reptiles.
DINICHTHYS (Gr. _deinos_, terrible; _ichthus_, fish). An extinct genus of Fishes.
DINOCERAS (Gr. _deinos_, terrible; _keras_, horn). An extinct genus of Mammals.
DINOPHIS (Gr. _deinos_, terrible; _ophis_, snake). An extinct genus of Snakes.
DINORNIS (Gr. _deinos_, terrible; _ornis_, bird). An extinct genus of Birds.
DIPLOGRAPTUS (Gr. _diplos_, double; _grapho_, I write). A genus of Graptolites.
DIPNOI (Gr. _dis_, twice; _pnoe_, breath). An order of Fishes, comprising the Mud-fishes, so called in allusion to their double mode of respiration.
DIPROTODON (Gr. _dis_, twice; _protos_, first; _odous_, tooth).
A genus of extinct Marsupials.
DIPTERA (Gr. _dis_, twice; _pteron_, wing). An order of Insects characterised by the possession of two wings.
DISCOID (Gr. _diskos_, a quoit; _eidos_, form). Shaped like a round plate or quoit.
DOLOMITE (named after M. Dolomieu). Magnesian limestone.
DORSAL (Lat. _dorsum_, the back). Connected with or placed upon the back.
DROMATHERIUM (Gr. _dromaios_, nimble; _therion_, beast). A genus of Tria.s.sic Mammals.
DRYOPITHECUS (Gr. _drus_, an oak; _pithekos_, an ape). An extinct genus of Monkeys.
ECHINODERMATA (Gr. _echinos_; and _derma_, skin). A cla.s.s of animals comprising the Sea-urchins, Star-fishes, and others, most of which have spiny skins.
ECHINOIDEA (Gr. _echinos_; and _eidos_, form). An order of _Echinodermata_, comprising the Sea-urchins.
EDENTATA (Lat. _e_, without; _dens_, tooth). An order of _Mammalia_ often called _Bruta_.
EDENTULOUS. Toothless, without any dental apparatus. Applied to the mouth of any animal, or to the hinge of the Bivalve Molluscs.
ELASMOBRANCHII (Gr. _elasma_, a plate; _bragchia_, gill). An order of Fishes, including the Sharks and Rays.
ENALIOSAURIA (Gr. _enalios_, marine; _saura_, lizard), Sometimes employed as a common term to designate the extinct Reptilian orders of the _Ichthyosauria_ and _Plesiosauria_.
EOCENE (Gr. _eos_, dawn; _kainos_, new or recent). The lowest division of the Tertiary rocks, in which species of existing sh.e.l.ls are to a small extent represented.
EOPHYTON (Gr. _eos_, dawn; _phuton_, a plant). A genus of Cambrian fossils, supposed to be of a vegetable nature.
EOZOoN (Gr. _eos_, dawn; _zoon_, animal). A genus of chambered calcareous organisms found in the Laurentian and Huronian formations.
EQUILATERAL (Lat. _oequus_, equal; _latus_, side). Having its sides equal. Usually applied to the sh.e.l.ls of the _Brachiopoda_.
When applied to the spiral sh.e.l.ls of the _Foraminifera_, it means that all the convolutions of the sh.e.l.l lie in the same plane.
EQUISETACEae (Lat. _equus_, horse; _seta_, bristle). A group of Cryptogamous plants, commonly known as "Horse-tails."
EQUIVALVE (Lat. _oequus_, equal; _valvoe_, folding-doors). Applied to sh.e.l.ls which are composed of two equal pieces or valves.
ERRANTIA (Lat. _erro_, I wander). An order of _Annelida_, often called _Nereidea_, distinguished by their great locomotive powers.
EUOMPHALUS (Gr. _eu_, well; _omphalos_, navel). An extinct genus of Univalve Molluscs.
EURYPTERIDA (Gr. _eurus_, broad; _pteron_, wing). An extinct sub-order of _Crustacea_.
EXOGYRA (Gr. _exo_, outside; _guros_, circle). An extinct genus of Oysters.
