. Guide leaflet. Ahovz: The green crab above is notedible, but is a pugnacious fighter Below: A spider crab, which has camou-flaged himself by plucking tufts ofBugula and placing them on his back M. C. iJickerson A roughspinedspider crab, whichhas lost one claw Below: A lady crab is shown swimming vigorously in an attempt to escape from a lobster. 14 NATURAL HISTORY thus r(nd(Tin^ pootic justice to the formerconquering horde. Enemies of Mollusks These beds of shellfish, of course,attract the enemies of bivalve mollusks ingreat abundance. The most important ofthese are the oyster drill {Urosalp
. Guide leaflet. Ahovz: The green crab above is notedible, but is a pugnacious fighter Below: A spider crab, which has camou-flaged himself by plucking tufts ofBugula and placing them on his back M. C. iJickerson A roughspinedspider crab, whichhas lost one claw Below: A lady crab is shown swimming vigorously in an attempt to escape from a lobster. 14 NATURAL HISTORY thus r(nd(Tin^ pootic justice to the formerconquering horde. Enemies of Mollusks These beds of shellfish, of course,attract the enemies of bivalve mollusks ingreat abundance. The most important ofthese are the oyster drill {Urosalpinxcinerea) and the common sea stars (As-terias vulgaris and forhesi). The formerbores neat little pinholes in an oyster shell,and sucks out the contents, while thelatter mounts the oyster, applies the pneu-matic disks of its tube-feet to the twovalves, and, bracing the tips of its armsagainst surrounding objects, pulls theshells open by main force and proceedsto devour their contents. The oysters are not naturally found inmuddy locaUties, but have been trans-planted there by man, by spreading shellsto form a clutch. They belong moreproperly on a rocky bottom. The animals most typically associatedwith more or less muddy regions are thesea worms. Burrowing in the soil every-where, they construct tubes of greater orless consistency, or, in s
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
