. The shell book . 1 Chiton ecftinatus. 2 Ischnochiton conspicuus. CHITONS AND BUBBLE SHELLS 3 Bulla nebulnsa. 5 A phi strum aplustre. 1 Hydatina albo-cincta. 9 Hydalinn albo-cincfa, 4 Btilij ampulla Q Atys Naucitm. 8 Haminea inrescens (body extended). 10 Hydatina 1,2 TJclix Iomatia, the prin-cipal edible snail in Europe. LAND SNAILS AND UMBRELLA SHELL 3, 4 Pyramid ida solitarta. 6 Gastrodonta ligcra. 8 Pyramidida <iltert}jta. 5 Omphalina fuliginosa. 7 Polygyra albolahris. 9 Umbrella Indica. CHAPTER LIX: THE SEA BUTTERFLIES CLASS PTEROPODA A PELAGIC group of mollusks, reaching shor
. The shell book . 1 Chiton ecftinatus. 2 Ischnochiton conspicuus. CHITONS AND BUBBLE SHELLS 3 Bulla nebulnsa. 5 A phi strum aplustre. 1 Hydatina albo-cincta. 9 Hydalinn albo-cincfa, 4 Btilij ampulla Q Atys Naucitm. 8 Haminea inrescens (body extended). 10 Hydatina 1,2 TJclix Iomatia, the prin-cipal edible snail in Europe. LAND SNAILS AND UMBRELLA SHELL 3, 4 Pyramid ida solitarta. 6 Gastrodonta ligcra. 8 Pyramidida <iltert}jta. 5 Omphalina fuliginosa. 7 Polygyra albolahris. 9 Umbrella Indica. CHAPTER LIX: THE SEA BUTTERFLIES CLASS PTEROPODA A PELAGIC group of mollusks, reaching shore only by accident,as when storm-driven. They live in communities, in all seas;the Arctic species are the most highly coloured. They rise tothe surface at twilight; rarely specimens come up in feed upon microscopic mollusks and crustaceans. The pteropods are all small mollusks, naked or with small,transparent shells, internal or external. Some are trumpet-shaped, some cylindrical, with needle-like shells. Others arepyramidal or globular. Shells like those of the pearly nautilus,the purples and the Hungarian cap occur among the spiral foot is dilated into two wing-like swimming disks, or thesedisks occur as accessory organs of locomotion, the
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Keywords: ., bookcentury1900, bookdecade1900, bookidshellbook00r, bookyear1908
