The Cambridge natural history . Fis-surellidaca, Pupillaea, Lucapina, Mega-tebennus, Macroschisma, Jjucapinella.(iii.) Fttuirgimdinae. Shell usuallywholly external, apex usually not re-niautie; xii, movod byperforation,sometinies with in-ternal septum, anal tube in a narrow slitor sinus. Genera : Glyphis, externals of Fissurella, but hole-callustruncated behind ; Fwncturella (sub-genera Cranopsis and Fissuri--srj:;^«),slit just anterior to the apex,a small internal septum; Zeidora,large internal septum as in Crrpidula : Fmarginula, shell elevated,slit very narrow, on the anterior margin (in su
The Cambridge natural history . Fis-surellidaca, Pupillaea, Lucapina, Mega-tebennus, Macroschisma, Jjucapinella.(iii.) Fttuirgimdinae. Shell usuallywholly external, apex usually not re-niautie; xii, movod byperforation,sometinies with in-ternal septum, anal tube in a narrow slitor sinus. Genera : Glyphis, externals of Fissurella, but hole-callustruncated behind ; Fwncturella (sub-genera Cranopsis and Fissuri--srj:;^«),slit just anterior to the apex,a small internal septum; Zeidora,large internal septum as in Crrpidula : Fmarginula, shell elevated,slit very narrow, on the anterior margin (in subg. Fimula, it isbetween the apex and the margin), radula bilaterally asymmetrical;Sid)einargi7iula, margin indented by a shallow groove; Scutus( = Farmophorus) shell oblong, depressed, nicked in front, largelycovered by the mantle. Fam. 2. Hcdiotidae.—Eight ctenidiuni the smaller, epipodialline broad, profusely lobed ; sludl rather ilattened, spire sliort, lastwliorl very large, with a row of perforations on the left side,. Fig. 268.—Scutus (mstralis LamAustralia : vi, vishell. X %. DIOTOCARDIA—RHIPIDOGLOSSA 407 which l)OcomG successively ohliterated ; through these holes, theposterior of which is anal, pass tentacular appendages of the mantle ; no operculum. Cretaceous . Single genus, Haliotis; principal sub-genera Fadollas, Teinolls. Fam. 3. Plcurotomariidae.—Central tooth single, narrow,al)0ut 26 laterals, GO to 70 uncini. Shell generally variouslytrocliiform, nacreous, opercidate, with a rather broad marginalsinus in the last whorl; as this sinus closes up it forms an anal fasciole or sinus band. Cand)rian . Principal genera : Seissurrlla, epipodial line with several long ciliated ap})endages ateach side, shell very small, slit open, sinus band extending nearlyto apex ; Schismopc, anal slit closed in the adult into an oblongperforation; Murchisonia (Palaeozoic only), shell long, turretted,whorls angulate or keeled with a sinus Ijand; Odontomaria(Palaeozoic only),
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
