. The shell book . MARSH ANT) APPLE SXAILS Marsh Snail, Viinpara Bengalensis. 5 Marsh Snail. Vivipara imertexta. Marsh Snail. Vhipara conlecloides. 6 Jug Apple Snail. Ampullaria ampullacea. Prickly Black Snail, Melania asperala. ^ Purple Apple Snail. Ampullaria purpurea. Flattened Apple Snail, Ampullaria dtpressa. 8 Rams-horn Apple Snail, Ampullaria cornu-ariclis. 9 Green Apple Snail, Campeloma 1 <vti,.t,tnja pulchra. 2 i yefatiu uixini, , 6, 7 lt< • . ..V/crt ROUND-MOUTHED SNAILS 4 (kondropotna magnifies. 5 Cydostoma stilnitti. 8 Otopoma mtlit-oiilf;. 9 Cyrli^ftnni (n\-ii r
. The shell book . MARSH ANT) APPLE SXAILS Marsh Snail, Viinpara Bengalensis. 5 Marsh Snail. Vivipara imertexta. Marsh Snail. Vhipara conlecloides. 6 Jug Apple Snail. Ampullaria ampullacea. Prickly Black Snail, Melania asperala. ^ Purple Apple Snail. Ampullaria purpurea. Flattened Apple Snail, Ampullaria dtpressa. 8 Rams-horn Apple Snail, Ampullaria cornu-ariclis. 9 Green Apple Snail, Campeloma 1 <vti,.t,tnja pulchra. 2 i yefatiu uixini, , 6, 7 lt< • . ..V/crt ROUND-MOUTHED SNAILS 4 (kondropotna magnifies. 5 Cydostoma stilnitti. 8 Otopoma mtlit-oiilf;. 9 Cyrli^ftnni (n\-ii ranum . 10 Cyclophows volvulus. 1 t Cyelflplwrus Adotusielltt rniralnlis. The River Snails the Mississippi, but well represented (as is no other genus) onthe Pacific slope of the Rocky Mountains. The collector must search for these snails in the clear waterof creeks that flow down mountain slopes. The green algae aretheir accustomed food. The Virginian Goniobasis (G. Virginica, Gmel.) is slenderand long, with about six whorls, rounded a little, and bandedwith red near the middle and base of each. Some forms arefinely ridged throughout, with ten or twenty lines on the bodywhorl. The tip is always worn off. The colour is dark brown orolivaceous. Length, i to ij inches. Habitat.— Delaware and Schuylkill rivers. The Plaited River Shell (G. plicifera, Lea) has keen-edged folds crossin
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Keywords: ., bookcentury1900, bookdecade1900, bookidshellbook00r, bookyear1908
