The Cambridge natural history . ip thickened, canal short, operculum claw-shaped, notched, nucleus terminal. Tertiary -. Single genus, Struthiolaria (subg., Perissodonta, marginal teeth multiplied). Fam. 38. Cypraeidae.—Mantle with two large lateral lobesreflected and meeting over the shell, siphon small; central andlat(u-al teeth bluntly tricuspid or multicuspid, laterals fairlybroad, edges cusped or finely pectinate; shell polished, solid,spire generally concealed in the adult or overlaid with enamel,aperture straight, narrow, nearly as long as the shell, toothed at MONOTOCARDIA TAENIOGLOSSA
The Cambridge natural history . ip thickened, canal short, operculum claw-shaped, notched, nucleus terminal. Tertiary -. Single genus, Struthiolaria (subg., Perissodonta, marginal teeth multiplied). Fam. 38. Cypraeidae.—Mantle with two large lateral lobesreflected and meeting over the shell, siphon small; central andlat(u-al teeth bluntly tricuspid or multicuspid, laterals fairlybroad, edges cusped or finely pectinate; shell polished, solid,spire generally concealed in the adult or overlaid with enamel,aperture straight, narrow, nearly as long as the shell, toothed at MONOTOCARDIA TAENIOGLOSSA 419 the sides, channelled at each end, lahiuni inflected; no operculum. Jurassic . Genera : Ovula (including Amphipcras, Trans- ovula, Cyphoma, Radius, Simnia), Pedicularia, Cypraea (withsubg., Cypraeovida, Cypraexlia, and Trivia), and Erato. Fam. 39. Doliidar.—Foot expanded, wider and longer thanthe shell, truncated and thickened in front, siphon very long andnarrow; central tooth with very strong median and small lateral. Fig. 277. -Three stages in the growth of Pteroceras rugosum Sowh., E. Indies,showing the development of the fingers. and basal cusps, lateral and marginals bluntly folciform; sliellventricose, without varices, spire short, outer lip generally simple, anterior canal rather wide, no operculum. Cretaceous . Genera : Dolium (subg. Malca, outer lip thickened, denticulate,reflected); Firida, mantle with two lateral lobes reflected overpart of the shell, shell fig-shaped (Fig. 278). Fam. 40. Cassididae.—Foot broad, siphon long (radula, , p. 223); shell ventricose, with varices, spire short, outerlip reflected or thickened, anterior canal short, recurved narrow;oY>erculum semilunar, with ribs radiating from a marginal 420 MONOTOCARDIA TAENIOGLOSSA chap. nucleus. Cretaceous . Genera : Cassis (subg. Seinicassis and Cypraecassis), Morio (== Cassiclaria), Oviiscia. Fam. 41, Colurribellinidae —Shell solid, ribbed, usuallycancellated, with an oblique po
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
