The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth |
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Page 296
... Gastropods ( snails and slugs ) 301 to barrel - shaped tusk shells ( Scaphopoda ) ; and the nau- tiluses , cuttlefishes , squids , and octopuses ( Cephalopoda ) . In this article the biology and classification of mollusks are first ...
... Gastropods ( snails and slugs ) 301 to barrel - shaped tusk shells ( Scaphopoda ) ; and the nau- tiluses , cuttlefishes , squids , and octopuses ( Cephalopoda ) . In this article the biology and classification of mollusks are first ...
Page 299
... gastropods . Various bivalves ( e.g. , cockles ) and snails may perform rapid twists or jumps through violent flexion of the foot . Buoyancy floating and jet propulsion are found in cephalopods ; floating is also known in gastropods ...
... gastropods . Various bivalves ( e.g. , cockles ) and snails may perform rapid twists or jumps through violent flexion of the foot . Buoyancy floating and jet propulsion are found in cephalopods ; floating is also known in gastropods ...
Page 307
... gastropods. pry into shelled prey . Many genera ( e.g. , Busycon , Fasci- olaria , some Murex ) use part of their shell to wedge open a clam for feeding . Finally , the toxoglossate radula has only two teeth , which are formed and used ...
... gastropods. pry into shelled prey . Many genera ( e.g. , Busycon , Fasci- olaria , some Murex ) use part of their shell to wedge open a clam for feeding . Finally , the toxoglossate radula has only two teeth , which are formed and used ...
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