402 GLOSSARY. 



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 



shells are to a small extent represented. 



EOPHYTON (Gr. eos, dawn; phuton, a plant). A genus of Cam- 

 brian fossils, supposed to be of a vegetable nature. 

 Eozo'dN (Gr. eos, dawn; zoon, animal). A genus of chambered 



calcareous organisms found in the Laurentian and Huronian 



formations. 

 EQUILATERAL (Lat. cequus, equal; latus, side). Having its sides 



equal. Usually applied to the shells of the Brachiopoda. 



When applied to the spiral shells of the Foraminifera, it 



means that all the convolutions of the shell lie in the same 



plane. 

 EQUISETACE^E (Lat. equus, horse; seta, bristle). A group of 



Cryptogamous plants, commonly known as " Horse-tails. " 

 EQUIVALVE (Lat. (equus, equal; valvce, folding-doors). Applied 



to shells 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. 



FAUNA (Lat. Fauni, the rural deities of the Romans). The 

 general assemblage of the animals of any region or district. 



FAVOSITES (Lat. favos, a honeycomb). A genus of Tabulate 

 Corals. 



FENESTELLID^: (Lat. fenestella, a little window). The "Lace- 

 corals, " a group of Palaeozoic Polyzoans. 



FILICES (Lat. filix, a fern). The order of Cryptogamic plants 

 comprising the Ferns. 



FILIFORM (Lat. filum, a thread; forma, shape). Thread-shaped. 



FLORA (Lat. Flora, the goddess of flowers). The general 

 assemblage of the plants of any region or district. 



FORAMINIFERA (Lat. foramen, an aperture; fero, I carry). An 

 order of Protozoa, usually characterized by the possession of 

 a shell perforated by numerous pseudopodial apertures. 



FRUGIVOROUS (Lat. frux, fruit; voro, I devour). Living upon 

 fruits. 



FUCOIDS (Lat. fucus, sea-weed; Gr. eidos, likeness). Fossils 

 often of an obscure nature, believed to be the remains of 

 sea-weeds. 



FUSULINA (Lat. fusus, a spindle). An extinct genus of Fora- 

 minifera. 



