( 3" ) 
Th^fe Worms areinclofed in a Shell, which is grayifli and of the bigncfs 
of a Barly-com, (harper ac one end, than the other. By the means of an 
excellent Aficrofcope i have obfervM, that 'tis all overfpread with little 
Stones and licde greenifti Eggs • and that there is at the (harpeft end a 
htile hole, by which thefe Creatures caft out their excrement, and at the 
Oiher end, a fomewhat bigger hole, through which they put out their ^ 
heads aud faftcn ihemfelves to the Stones, they gnaw\ They are not fo 
fhut up, but that fomctiroes they come out,.and walk abroad. They arc all 
black, about two Lines of an inch long and three quarters of a Line large. 
Their Body is diftinguiih'c into feveral plyes, and near their head they have 
three feet on each (ide, which have but two Joynts refembling tbofe of a 
Lowfe. When they move, their Body is commonly upwards, with their 
mouth againft the Stone* They have a big head, fomewhat flat, and even, 
of the colour of a Tortoife- Shell, braunifh, withfome fmall white hair , 
Their mouth is alfo big where may be feen four kinds of Jaw-bones, lying 
croffewife, which they move continually , opening and (hutting them like a 
pair of Compaffes with four branches. The Jaws on both fides of the mouth 
are all black- the nether Jaw hath a point hke the Sting of a Bee, but uni- 
form. They draw threds out of their mouth with their fore- feet, ufing 
I bat point to. range them, and to form their Shells of them* They have Ten 
t:yes, very black and round, which appear to be bigger than a Pins- head. 
There arc fivt of them on each fide of the head, ftandmg after this manner, 
o \ o 
o o o o 
o o. 
But befides thefe Worms,! have founds that Mortar is eaten by an infinite . 
number of fmall Creatures, of the bignefsof Gheef-Mites. Thcff have but 
two Eyes, and arc blackiih* They have four feet on each fide pretty long, 
The^oiat of their Muzzle is very (harp, as that of a Spider. I fend you but 
one of them, though 1 had abundance, but they are dead and loft. It may 
be, you'l find fome at P/zr^V, feeing that in the old Mortar betwixt Stones, 
I hat is found in Walls made with rubbi(h, there is great ftorc of them, toge- 
ther with great plenty of their little Eggs, I have not yet examined, whe- 
ther thefe be tho(e, that in the fur faces of all the Stones, where they are 
met with, make little round holes, and fmall traces and impreilions, which 
mjike them look like wornt- eaten- jVood^ But *tis probable, they are fuch. It 
fliould be obferved, whether thefe Worms do not take Wings, and all the - 
other appearances of Caterpillars^ and whether they are not to be found 
ia Plaifcer that is full of holes, in Bricks, in Greety Stonc9,and in Rocks. 
You may obferve more of them in Walls cxpofed to the .Jo^tif?, than in 
others j and that the Worms, that eat the Stone, live longer, then thofc, 
|hat 
