Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 -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-
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 -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 breathe. Fig. 47. CYCLOSTOMA.
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