. The shell book . parts of the body reach the aperture; theposterior parts extend towards the apex. The ventral part ofthe body is underneath when the foot is extended. It is theinner, short side of the coil. The dorsal part is the arch of thebody, the long, outer side of the coil. These terms are necessaryto designate the relative positions of the internal organs. THE SOFT PARTS The mantle is the fleshy web that covers the body andlines the shell. In the spire it is attached to the body, and isvery thin. In the body whorl it is free from the body, and en-closes the mantle cavity. It forms a
. The shell book . parts of the body reach the aperture; theposterior parts extend towards the apex. The ventral part ofthe body is underneath when the foot is extended. It is theinner, short side of the coil. The dorsal part is the arch of thebody, the long, outer side of the coil. These terms are necessaryto designate the relative positions of the internal organs. THE SOFT PARTS The mantle is the fleshy web that covers the body andlines the shell. In the spire it is attached to the body, and isvery thin. In the body whorl it is free from the body, and en-closes the mantle cavity. It forms a thickened collar around thebody, and fits the shell aperture. This collar is attached at 21 A Typical Univalve Mollusk SOFT PARTS OF A UNIVALVE (Mantle chamber laid open) Pyrula sp. p. proboscis I. tentacles /, foot 5, siphon m. mantle tn~ct mantle chamber 0, osphradiumg< KiS y, cesophagush, heart 1, intestine d, duct of male reproductive gland ft, kidney H, liver or, female reproductive {ar, male reproductive j.
Size: 962px × 2598px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidshellbook00r, bookyear1908
