Encyclopædia britannica : or, A dictionary of arts, sciences, and miscellaneous literature : constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises or systems .. . numerous Ihoots. Thefecond is very thin and tranfparent, without any particular vefTel being ditlinguilhable in it. The third iscompofed of fcaly threads, generally of a fpiral form ;and fo near each other as fcarcely to leave any inter-val. They are curioufly united with the membranewhich occupies the intervals ; and form a tube whichis always open, notwithflanding the flexu
Encyclopædia britannica : or, A dictionary of arts, sciences, and miscellaneous literature : constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises or systems .. . numerous Ihoots. Thefecond is very thin and tranfparent, without any particular vefTel being ditlinguilhable in it. The third iscompofed of fcaly threads, generally of a fpiral form ;and fo near each other as fcarcely to leave any inter-val. They are curioufly united with the membranewhich occupies the intervals ; and form a tube whichis always open, notwithflanding the flexure of thevefTcl. There are alfo many other peculiarities in itsflrudture. The principal tracheal veffels divide into1326 different branches. The heart of the coffus is very different from that oflarger animals, being almoll as long as the animal it-felf. It lies immediately under the fkin at the top ofthe back, entering the head, and terminating near themouth. Towards the lafl rings of the body it is largeand capacious, diminifhing very much as it approachesthe head, from the fourth to the twelfth divilion. Onboth fides, at each divilion, it has an appendage, which partly G^ ^Ui^rr^uvy^iu: <r%^.?/6 riate CCCiV. i » « W«te CCCT
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