EULIMA. Risso. _Fam._ Scalariens, Lam.--_Descr._ Elongated, smooth, pyramidal; spire long, composed of numerous whorls; apex acute, slightly tortuous; aperture oval, rounded anteriorly, acute at the posterior union with the body whorl; outer lip slightly thickened; columella smooth. Fig. 347, E. labiosa, fig. 348, E. splendidula. A complete illustrated monograph of this genus of pretty shining little shells, consisting of 15 known species, is given in parts 52 and 53 of the Conchological Illustrations by the author. EUOMPHALUS. Sow. _Fam._ Scalariens, Lam.--_Descr._ Orbicular, planorbular spire, with three or four volutions, imbricated above; smooth below; aperture of a round polygonal form; umbilicus large, penetrating to the apex of the shell.--_Obs._ This genus of fossils very nearly resembles Delphinula. The main difference appears to be that the whorls do not increase so rapidly in size in the former as in the latter. Fossil, in the Carboniferous Limestone. Fig. 350. EXOGYRA. Sow. A genus of fossil bivalves, resembling Chama in shape and Ostræa in structure, having but one muscular impression in each valve. Fig. 183. EXSERTED. Standing out, protruding. EXTERNAL. An external shell is one which contains the animal, and is not covered by the mantle. FASCIATED. (_fascia_, a band.) Banded or striped. Ex. Carocolla marginata, fig. 277. FASCICULATED. (from fasciculum.) A little bunch of hairs or bristles against each end of each valve, characterizes some species of the genus Chiton, which are termed fasciculated species. FASCIOLARIA. Lam. _Fam._ Canalifera, Lam. Siphonostomata, Bl.--_Descr._ Elongated, fusiform, ventricose; spire conical, consisting of few rounded or angulated whorls; aperture wide, terminating in a long straight open canal: columella lip with several oblique folds, the lower of which is larger than the rest; operculum horny, pyriform.--_Obs._ This genus is known from Fusus by the folds on the columella; from Turbinella, by their obliquity and the last being larger than the rest. Fig. 386, F. Trapezium. East and West Indies and Australia. FAUNUS. Montf. MELANOPSIS, Auct. FERRUGINEOUS. Of an iron rust colour. FERUSSINA. Grateloup. STROPHOSTOMA, Deshayes. FIBROUS. A shell is said to be of a fibrous structure when a fracture would present a series of perpendicular fibres, as Pinna. FICULA. Sw. A generic group of shells, consisting of those species of PYRULA, Auct. which have the true pear-shaped character. Fig. 390, P. Ficus. Sowerby confines the name Pyrula to these species. FIMBRIA. Megerle. CORBIS, Lam. FIMBRIATED. Fringed; as Murex fimbriatus, a delicate white species, with broad fringed varices. FISSURE. (_Fissura_, a slit.) A slit or cut, a narrow perforation, as in Emarginula and Fissurella.