A treatise on malacology; or, Shells and shell fish . on the outerlip ; aperture mostly round. Plicadomus Sw. Spire moderate, regular, and thick,but gradually conic; the tip obtuse ; aperture perpen-dicular ; inner lip wanting ; outer lip semicircular ;the margin dilated and reflected. P. sulcata. Chem. J 35. f. 1231, Lam. Spire thickest towards the middle; thetip abruptly pointed ; aperture oval; the lips con-siderably thickened and united; a single plait gene-rally on the pillar. P. mumia. Mart. 153. f. 1439.* This seems to represent Streptaxls. PART II. 333 Gonospira Sw
A treatise on malacology; or, Shells and shell fish . on the outerlip ; aperture mostly round. Plicadomus Sw. Spire moderate, regular, and thick,but gradually conic; the tip obtuse ; aperture perpen-dicular ; inner lip wanting ; outer lip semicircular ;the margin dilated and reflected. P. sulcata. Chem. J 35. f. 1231, Lam. Spire thickest towards the middle; thetip abruptly pointed ; aperture oval; the lips con-siderably thickened and united; a single plait gene-rally on the pillar. P. mumia. Mart. 153. f. 1439.* This seems to represent Streptaxls. PART II. 333 Gonospira Sw. Spire perfectly cylindrical, of equalthickness, the tip obtuse, with the whorls large ; aper-ture oval; lips thickened; pillar with or without aplait. G. polanga Desk. Lesson, Voy. pi. 8. f. 8. Megaspira Lea. Spire excessively long, of more than twenty volutions, and of nearly equal thickness ; the tip persistent, and slightly pointed; aperture rounded; outer lip thin; pillar and inner lip with sharp plaits. M. elatior Spix. Test. Braz. 15. f. Siphonostoma Guild. Spire excessively long, pointed, but the upper portion deciduous; aperture circular, spreading ; the lips united, and detached from the adjoining whorl, (^fig. 97. c. d.) S. costata Guild, [jig. 97. c, d.}fasciata. En. Meth. 461. f. 7. Helicella Feruss. Shell discoid,but the body-whorl thick andventricose ; the spire very smalland sunk ; pillar none; aperturesemicircular ; outer lip thickened;umbilicus very wide. (^^. 98.) pellis-serpentis (_^^. 98.); also pi. 66. 73. 75. 77.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
