Economic mollusca of Acadia economicmollusca00gano Year: 1889 THE ECONOMIC MOLLUSCA OF ACADIA. 39 is the young of the Whelli, Buccinum undatum. From this it differs iu the absence of the longitudinal undulations and in the shape of the lowest part of the free edge of the opening. As stated under the des- cription of B. undatum, this in P. lapillus is more or less angular and never lower than the lowest point (the apex being considered the upper Fig. I. â Turpura lapillus. Natural Size. â end of the shell) of the columella, or central pillar around which the whorls are wound. In B. undatum
Economic mollusca of Acadia economicmollusca00gano Year: 1889 THE ECONOMIC MOLLUSCA OF ACADIA. 39 is the young of the Whelli, Buccinum undatum. From this it differs iu the absence of the longitudinal undulations and in the shape of the lowest part of the free edge of the opening. As stated under the des- cription of B. undatum, this in P. lapillus is more or less angular and never lower than the lowest point (the apex being considered the upper Fig. I. â Turpura lapillus. Natural Size. â end of the shell) of the columella, or central pillar around which the whorls are wound. In B. undatum on the other hand, it is always evenly rounded, and always a little lower than the extremity of the columella. Through all its variations, it yet presents a certain individuality of its own not describable in words, which makes it easily recognizable when once the student has become familiar with it. The Purple-shell lives upon rocky shores between high and low- water marks, particularly near the latter. It rather prefers exposed situations and is often found on ledges exposed to the full force of the ocean swell. It is very voracious and attacks nearly all of the littoral Molluscs, into the shells of which it can easily bore an opening by means of its filelike tongue. One writer tells us that it can bore through the shell of the common Mussel in from three to live minutes, while others, with more show of probability say that it takes two days. Can not some of our teachers or students who live near the shore, throw some light oipon such questions at this? Through the hole, not larger than a large pin head, the animal thrusts its proboscis, and sucks out the juices of its prey at its leisure. The Oyster is a favorite food, and great damage is done to Oyster beds by this species. In England it is considered ' one of the greatest if not the most destructive of the Oysters enemies.' It has been so bad at times on the English beds that sixpence per liundred has been paid to colle
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