. The Cambridge natural history. Zoology; Zoologia Geral. VI BREATHING ORGANS IN OPISTHOBRANCHIATA 159 both lateral and posterior branchiae well developed, Clione and Halopsyche are destitute of either, while the four remaining fam- ilies have one branchia, sometimes lateral, sometimes posterior.^ Certain of the Nudibranchiata possess no special breathing organs, and prob- /^^^-^^^^^^ ably respire through the skin (^Uli/^ia, Limajjontia, Cenia^ Pliyllirrlioe). The majority, however, have developed sec- ondary branchiae, in the form of promi- nent lobes or leaf-like processes (the cerata)^ w
. The Cambridge natural history. Zoology; Zoologia Geral. VI BREATHING ORGANS IN OPISTHOBRANCHIATA 159 both lateral and posterior branchiae well developed, Clione and Halopsyche are destitute of either, while the four remaining fam- ilies have one branchia, sometimes lateral, sometimes posterior.^ Certain of the Nudibranchiata possess no special breathing organs, and prob- /^^^-^^^^^^ ably respire through the skin (^Uli/^ia, Limajjontia, Cenia^ Pliyllirrlioe). The majority, however, have developed sec- ondary branchiae, in the form of promi- nent lobes or leaf-like processes (the cerata)^ which are carried upon the back, without any means of protection. These cerata are, as a rule, of extreme beauty and variety of form, consisting sometimes of long whip-like tentaculae, in other cases of arborescent plumes of fern-like leafage, in others of curious bead-like appendages of every imaginable shape and colour. In Doris they lie at the posterior end of the. Fig. 66. — Valvata piscinalis Miill.; br, branchia; fi, filament; /./, foot lobes. (After Boutan.) /''. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. [London, Macmillan and co. , limited; New York, The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
