. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. -a The Wentletrap or Precious Scalaria {fig- 46) has the volu- tions connected by longitudinal ribs. 35. The , which are dis- tinguished by the absence of branchiae, and by their aerial respiration, also have a shell with a round mouth, closed by a thin circu- lar operculum {fig. 47, 6) ; it is in form of an oval spire, and finely striated transversely.— These animals live in woods, under moss and Fig. 46.—SCALARIA. stones. 36. Finally, the fresh-water mollusks, named Valvata,—in which the shell somew
. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. -a The Wentletrap or Precious Scalaria {fig- 46) has the volu- tions connected by longitudinal ribs. 35. The , which are dis- tinguished by the absence of branchiae, and by their aerial respiration, also have a shell with a round mouth, closed by a thin circu- lar operculum {fig. 47, 6) ; it is in form of an oval spire, and finely striated transversely.— These animals live in woods, under moss and Fig. 46.—SCALARIA. stones. 36. Finally, the fresh-water mollusks, named Valvata,—in which the shell somewhat resembles that of the Planorbis,. but has a circular aperture,, furnished with an operculum,—^also take their place here. One species, which inhabits stagnant waters in France, has been called the feather hearevy from the manner in which the branchia, which is in form of a feather, is protruded and floats Fig. 48. ^^ ^he surface of the water when the animal VALVATA. wishes to Fig. 47. 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
Size: 1193px × 2095px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
