Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 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%%%%%%
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 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 FiS- 53. MELANIA. 41. How is the g^enus Phasiane'Ila characterized ? (Phasianella, from the Greek, Phasianos, a pheasant, because this shell bears some resem- bl ince to the pheasant in its colours.) 42. How is the g'enus Ampulla'ria recognised ? 43. What are the characters of the genus Mela'nia ? (Melania, from the Gree>k, mplas, black.) 44 What are the characters of the genus Janthi'na ? (Janthina,fromthe Gre'jk ianthon^ violet colour.)
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