A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . xj^/ Fig. 4, 5, 6. BmcJuopoda* 5. The conckifera,] or ordinary bivalves, (like the oyster),breathe by two pairs of giUs, in the form of flat membraneousplates, attached to the mantle ; one valve is applied to the right,the other to the left side of the body. 6. The tunicata have no shell, but are protected by an elas-tic, gelatinous tunic, with two orifices; the breathing-organtakes the form of an inner tunic, or of a riband stretched acrossthe internal cavity. Five of these modifications of the molluscan type o
A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . xj^/ Fig. 4, 5, 6. BmcJuopoda* 5. The conckifera,] or ordinary bivalves, (like the oyster),breathe by two pairs of giUs, in the form of flat membraneousplates, attached to the mantle ; one valve is applied to the right,the other to the left side of the body. 6. The tunicata have no shell, but are protected by an elas-tic, gelatinous tunic, with two orifices; the breathing-organtakes the form of an inner tunic, or of a riband stretched acrossthe internal cavity. Five of these modifications of the molluscan type of organiza-tion, were known to Linnaeus, who refeiTed the animals of allhis genera of shell-fish to one or other of them ;| but unfortu-nately he did not himself adopt the truth which he was the first * Fig. 4. (3). Rhi/nchonella psiftacea,Cher[i, sp., dorsal valve, -svith theanimal (after Owen). 5, 6, Terebratula avstralis, Quoy. From specimenscollected by Mr. Jukes. (2). Ideal side view of both valves, (f, the retractormuscles, by which the valves are opened). (1). Dorsal val
Size: 1684px × 1484px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, booksubjectmollusks, bookyear185
