The Cambridge natural history . Fici. 67. — Doris (Arrliidons)tuhercvlula L., Britain : a,anus ; hr, branchiae, sur-rounding tlie anus ; vi, maleorgan ; rh, rh, rhinoi) h- Fig. 68. — Pleiiroj)hyllidin hncataOtto, Mediterranean : a, anus ; Itr,secondary branchiae ; m, mouth ;, sexual orifice. body, in a sf)rt of rosette, which is generally capable of retraction into a chamber. In Fhyllidia and Pleuroyhyllidia these secondary branchiae lie, as in Fatella, on the lateral portions of the mantle. ^ Pelseiieer, Cliallewjcr Reports, vol. xxiii. part. l6o BREATHING ORGANS IN PULMON
The Cambridge natural history . Fici. 67. — Doris (Arrliidons)tuhercvlula L., Britain : a,anus ; hr, branchiae, sur-rounding tlie anus ; vi, maleorgan ; rh, rh, rhinoi) h- Fig. 68. — Pleiiroj)hyllidin hncataOtto, Mediterranean : a, anus ; Itr,secondary branchiae ; m, mouth ;, sexual orifice. body, in a sf)rt of rosette, which is generally capable of retraction into a chamber. In Fhyllidia and Pleuroyhyllidia these secondary branchiae lie, as in Fatella, on the lateral portions of the mantle. ^ Pelseiieer, Cliallewjcr Reports, vol. xxiii. part. l6o BREATHING ORGANS IN PULMONATA chap. The Scaphopoda in all probability possess neither true norsecondary branchiae. Pidmonata.—When we use the term hmg, it must beremembered that this organ in the Mollusca does not correspond,morpliologicall}, with the spongy, ceHular lung of vertebrates :it simply performs the same functions. The lung, in theMollusca, is a pouch or cavity, lined with blood-vessels whichare disposed over its vaulted surface in various patterns ofnetwork. The pulmonary sac or cavity is therefore a bettername hy which to denote this organ. It seems prolmble, as has been already sh
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
