148 FISTULANA. 



bristles against each end of each valve, characterizes some 

 species of the genus Chiton, which are termed fasciculated species. 

 FASCIOLARIA. Lam. Fam. Canalifera, Lam. Siphonosto- 

 mata, 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. 

 FERUSSTNA. 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. 

 FISSURELLA. Brug. (Fissura, a fissure) Fam. Calyptracia, 

 Lam. Branchifera, Bl. — Descr . Patelliform, oval or oblong, 

 radiated ; apex anterior, perforated. — Obs. The Fissurellse are 

 known from Patellae by the perforation in the apex. Fig. 245. 

 The catalogue published by the author in the Conchological Illus- 

 trations, enumerates 68 species. 

 FISTULANA. Lam. (Fistula, a pipe.) Fam. Tubicolae, Lam. 

 Adesmacea, Bl. — Descr. A transversely elongated, equivalve, in- 

 equilateral bivalve, enclosed by a septum within the widest, closed 

 extremity of a straight calcareous tube. Fistulana is known 



