. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. PLEUROBRANCHUS.âAPLYSIA. 63. are composed of leaflets, more or less divided, at- tached along the right side {jig. 80, hr)^ or on the back (Jig. 81), and more or less covered by the mantle, which almost al- ways encloses a small â. o^ ,-'.,. , . , Fiff. 80. PLKUROBRANCHUS. shell in Us thickness.â Their form is very variable. They are divided into Pleurohran- chusy Pleurohranchides, Aplysia, Dolabella^ Akera, &c. 37. The Pleurobrajvchi are mol- lusks of an oval form ; in which the t branchite are fixed on the
. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. PLEUROBRANCHUS.âAPLYSIA. 63. are composed of leaflets, more or less divided, at- tached along the right side {jig. 80, hr)^ or on the back (Jig. 81), and more or less covered by the mantle, which almost al- ways encloses a small â. o^ ,-'.,. , . , Fiff. 80. PLKUROBRANCHUS. shell in Us thickness.â Their form is very variable. They are divided into Pleurohran- chusy Pleurohranchides, Aplysia, Dolabella^ Akera, &c. 37. The Pleurobrajvchi are mol- lusks of an oval form ; in which the t branchite are fixed on the right side, between the mantle and foot {fig. 80). y The mouth is in the form of a proboscis i or trunk, and is surmounted by a small triangular veil, and two tentacles; they have four stomachs, the second one of which is sometimes armed with bony pieces, and the anus opens behind the branchife. One species, of a lemon yellow colour, is found on the coasts of â m France. jj 88. The Aplysi-^, which the ancients called sea-hares, have a very singular form; the body resembles that of a sort of Limax; but the edges of the foot, erected in flexible crests, surround the back and may be even reflected over it. Their head is supported by a neck of greater or less length, and furnished with four tentacles (fg. 81, t), the two upper ones being hollowed like the ears of a quadruped, and placed above the eyes (y). The branchiae, in the form of very complicated. 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 Ruschenberger, W. S. W. (William Samuel Waithman), 1807-1895; Comté, Achille, 1802-1866; Milne-Edwards, H. (Henri), 1800-1885. Philadelphia : Grigg & Elliot
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
