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Sect. XVIII. 
Where the Body ends, the Tail begins, thicker 
than the Body, and rendered ftronger by circular 
Fibres. At its End it has two fmall hard Bodies, 
containing and defending the tender Extremities of 
the Tail. 
This Tail thicker than the Body terminates in two 
Ends, the thickeft of which certainly ferves for the 
Difcharge of the Excrements, the flendereft doubtlefs 
for Generation : And this it can ftretch out to an 
incredible Length, fo that in Worms that feemed to 
be in Copulation, it appeared above an Inch out of 
the Pile. 
The two fmall Bodies, that contain thefe Ends of 
the Tail, are of a harder Subftance than even the 
Hemicrania. The outer Part is gibbous, the inner 
hollowed. The lower End is bifid j whence I con- 
iefture, that they ferve the Animal for Feet, when 
it is mounting upright, or corroding the Wood j by 
leaning on them as on a Prop (Fig. 8.). 
Sect. XIX. 
The above- deferibed Worm dwells now very fe» 
curely in a tefcaceous Tube of a white Colour, which 
it exadly fills, yet fo as to be able to move with 
Freedom. ThkTube, like the Coverings of Snails, 
daily grows with the Animal, from the Matter 
which perfpires from its Body j whence it is fomc- 
times found ftrait, fometimes bent, according to the 
Courfe which the Worm fleered in corroding. 
Sect. 
