Fig. 280.—Turbinella pyrum Lam., Ceylon. × ⅔.
Fam. 7. Fasciolariidae.—Eyes at the outer base of the tentacles (radula, Fig. [121], p. 221); shell fusiform, spire long, canal often very long, columella often with a fold at the base; operculum corneous, nucleus terminal. Cretaceous——. Principal genera: Fusus (including Sinistralia, Aptyxis, Troschelia), with subg., Serrifusus (Cretaceous), Clavella (subg. Thersites), Fasciolaria, Latirus (subg. Polygona, Peristernia, Leucozonia, Lagena; Mazzalina (Eocene), Chascax).
Fig. 281.—Latirus (Leucozonia) cingulatus Wood, Panama.
Fam. 8. Mitridae.—Siphon rather long, with anterior appendages, eyes on the side of the tentacles, proboscis very long; radula variable, laterals sometimes lost (Fig. [120], p. 221); shell fusiform, solid, spire more or less pointed, columella with several prominent folds, the posterior the largest, aperture rather narrow, no operculum. Cretaceous——. Principal genera: Mitra (with many sections), subg., Strigatella, Mitreola, Mutyca, Dibaphus; Plochelaea (Tertiary), Thala; Turricula (with several sections), Cylindromitra, and Imbricaria.
Fam. 9. Volutidae.—Foot broad in front, head laterally dilated into lobes, on which are placed the sessile eyes; siphon prominent, with appendages at the base (radula, Fig. [122], p. 221); shell thick, often shining, fusiform, globular or cylindrical, columella projecting anteriorly, with several folds, the anterior of which is the largest, aperture notched, canal not produced, operculum generally absent. Cretaceous——. Principal genera: Cryptochorda (Eocene), Zidona, Provocator, Guivillea, Yetus (= Cymbium), Voluta (with many sections), Volutolithes (chiefly Eocene), Volutolyria, Lyria, Enaeta, Volutomitra.
Fam. 10. Marginellidae.—Foot broad, siphon without appendages, mantle largely reflected over the shell; radula without laterals, central tooth comb-like, cusps rather blunt; shell oval or conoidal, polished, aperture narrow, outer lip thickened, columella with many folds; no operculum. Eocene——. Principal genera: Marginella, with many sections and so-called sub-genera; Persicula, Pachybathron (?), Cystiscus, Microvoluta.
Fig. 282.—Voluta nivosa Lam., West Australia. × ⅔.
