The royal natural history . the day these animalslie quietly in theirhiding-places, butcome forth at twilightto swim about insearch of prey, whenthe whole body, sup-ported and in partpropelled by theparapodia, executesthe most gracefulwave-like move-ments. C shows aspecies of the genusGlycera, a compara-tively dull colouredform, which habitu-ally lies hidden insand. These wormsmake their burrowsby means of theirrelatively colossalproboscis, which isstudded with numer-ous little warts andteeth. From thegenus Glycera thereis naturally a passageto the sedentarygroup (Tubicola) ofpolychsetous anne
The royal natural history . the day these animalslie quietly in theirhiding-places, butcome forth at twilightto swim about insearch of prey, whenthe whole body, sup-ported and in partpropelled by theparapodia, executesthe most gracefulwave-like move-ments. C shows aspecies of the genusGlycera, a compara-tively dull colouredform, which habitu-ally lies hidden insand. These wormsmake their burrowsby means of theirrelatively colossalproboscis, which isstudded with numer-ous little warts andteeth. From thegenus Glycera thereis naturally a passageto the sedentarygroup (Tubicola) ofpolychsetous annelids,and we may take asour first example thesand - worm (Areni-cola piscatorum), re-presented of thenatural size in Dof the worm reaches alength of about 8inches. Individualsvary, however, muchin colour, according & VARIOUS ANNELIDS. to the nature of the ^ Hderomreis stage of Xcrcis; B, Phyllodoce laminosa; C, Glyo ; D, Sand-mud or sand in which worm or lug-worm, Arenicola piscatorum. (All nat. size.). 436 WORMS. they are found ; those living in clean sand being of a light tint, whereas blackspecimens frequent slimy sand, strongly impregnated with decaying organic segments of the body are not all alike; those at the front end beingfurnished with a few small, widely-separated tufts of bristles arranged inpairs; then follows a series in which the clusters of bristles are large, bush-like,and close together; while the end of the body is cylindrical and without bristlesand parapodia. The goblet - shaped organ, shown in the illustration, projectingfrom the head is the protruded proboscis. This worm, which is found on allthe coasts of Europe, is used by fishermen as bait. At low water, on some sandyshores, it may be found in vast numbers. In the family Clymenidce, to which belongs the worm known as Areniatragilis, the body is only divisible into two regions. The fore-part, which is of adirty red tint, alters its shape greatly owing to the retraction and e
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
