. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. 41. The Phasiattella {Jig. 51) have an oblong or pointed shell ; the aperture is higher than it is wide, and furnished with a strong operculum ; the base of the columella is flatten- ed, but there is no umbilicus. These animals inhabit the Indian Ocean, and their shells are much sought after by collectors, on account of the beauty of Fig. 51. PHASIANELLA PICTA, their colours, 42. The shell of the Ampullaria {fig. 52) is round, ventri- cose, with a short spire, as in most of the Helices; the aperture is higher th
. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. 41. The Phasiattella {Jig. 51) have an oblong or pointed shell ; the aperture is higher than it is wide, and furnished with a strong operculum ; the base of the columella is flatten- ed, but there is no umbilicus. These animals inhabit the Indian Ocean, and their shells are much sought after by collectors, on account of the beauty of Fig. 51. PHASIANELLA PICTA, their colours, 42. The shell of the Ampullaria {fig. 52) is round, ventri- cose, with a short spire, as in most of the Helices; the aperture is higher than it is wide, and provided with an operculum ; the columella is umbilicated. The Ampullariae inhabit the fresh or brackish waters of hot countries. Many species are found in the United Fig. 52.—AMPULLARIA. 43. The shell of the Melania {fig. 53) has the aperture higher than wide, and it enlarges opposite to the spire; the colu- mella has neither plicse (folds) nor umbili- cus ; the length of the spire is very various. The animal has long tentacles, the eyes be- ing at about one-third of their length, on the external side. The Melaniae inhabit fresh-water rivers; a number of species is met wilh in the United States. 44. The Janthin^ (j%- ^^) resemble snails in the general form of their shell, but differ considerably from the different mollusks we have described. 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
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
