The Cambridge natural history . s, mantle largely reflected over the shell; radula withoutlaterals, central tooth comb-like, cusps rather blunt; shell ovalor conoidal, polished, aperture narrow, outer lipthickened, columella with many folds ; no oper-culum. Eocene . Principal genera : Mar- ginella, with many sections and so-called sub-genera ; Persicida, Pachylathron (?), Cystiscus,Microvoluta. Fam. 11. Harpidae.—Foot large, with atransverse groove, separating off a semi-lunarpropodium; mantle partly reflected over theshell; shell ventricose, polished; spire short,strongly longitudinally ribbe
The Cambridge natural history . s, mantle largely reflected over the shell; radula withoutlaterals, central tooth comb-like, cusps rather blunt; shell ovalor conoidal, polished, aperture narrow, outer lipthickened, columella with many folds ; no oper-culum. Eocene . Principal genera : Mar- ginella, with many sections and so-called sub-genera ; Persicida, Pachylathron (?), Cystiscus,Microvoluta. Fam. 11. Harpidae.—Foot large, with atransverse groove, separating off a semi-lunarpropodium; mantle partly reflected over theshell; shell ventricose, polished; spire short,strongly longitudinally ribbed, ribs prolongedover the suture, columella callous; no oper-culum. Eocene . Single genus, Harim Fig. l^^^.—OUva par. Uy^Wt ^[RaXphyria Lam., , Panama. 1AM. 12. Olividae.—Propodium somi-lunar, with a longitudinal groove above, mesopodiumreflected laterally over the shell; central tooth of radula tri-cuspid on a very broad base, lateral simple, hooked; shell sub-cylindrical or fusiform, polished; aperture narrow, operculum. 426 MONOTOCARDIA TOXOGLOSSA CHAI. XIV present or absent. Cretaceous- Principal genera : Oliva(Figs. and 98, p. 200), Olivancillaria (in-cluding TAntricula and Agaronia), Olivella,Ancilla (subg. Ancillina). (c) ToxoCxLOSSA (p. 218).—Eadula with nor-mal formula 101., teeth large ; oesophaguswith a large poison gland ; animal carnivorous,exclusively marine. Fam. 1. —Eyes at the end ofthe tentacles, shell sul)ulate,many whorled, operculumwith terminal nucleus. Eocene . Single genus, Terehra, with severalsections. Fam. 2. Conidac.—Eyeson outer side of tentacles,siphon prominent; shell coni-cal or fusiform, aperture nar-row. Cretaceous . Principal genera: Conns, shell solid, spire short, aperture narrow, straight, internal par-titions partly absorbed; Co7iorhis, GenofAa (with several sections, chiefly Tertiary), Pus- ionella, Columharium, Clavatida, Surcula, Fleu- rotoma; Borsonia (Eocene), Drillia (sub: Mangilia (including Daphnella, C
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
