OFSTONES. 77 



Arbufcular columns are fometimes found entire in the Lamina 

 of mattery limeftone on the fhore of the brook below Simonburn- 

 caftlc ; from which I had a fmall mafs with fome very fair. 



Of the coralloid, called, Mycetetes y from its being compofed of 

 fine thin Lamella like the gills of mufhrooms, we have an elegant 

 fpecies of a conoid fhape, with tranfverfe fcrias from the center to 

 the circumference, forming a figure like the SUN. It is a beau- 

 tiful obj eel, white, fometimes with a tinge of red. It takes a 

 high polifh, and fometimes- by including in the middle, part of 

 the dark-coloured {lone it is found immerfed in, it forms a figure 

 on the other fide like that opake body the MOON, very ftriking 

 to the beholder, expecting no iuch thing as a lunar reprefenta- 

 tionon the reverie of afolarone. It is found from fix inches 

 and a half to three inches and a half in circumference at the 

 thickeft end, and from five inches and a half to two inches and 

 a half in length, in a black calcarious Hone on the fhore of the 

 brook at Simonburn. 



We have a variety of it of a comprefTed form, with tranfverfe, 

 undulated wrinkles, and a deep furrow on each fide lengthways; 

 two radiated figures at the ends, refembling two SUNS in minia- 

 ture, the glory in light grey circles, on a dark grey ground. It 

 is two inches and a half round at the thickeft end, two inches at 

 the fmaller, and an inch and a half long. It feems to be two 

 Fungit* united together, there appearing by the help of a mag- 

 nifier a kind of a flaw between them, not difcernible by the 

 naked eye. I had it from the bottom of the fame river. 



A Mycetetes with a large kind of Plexus or net-work in the 

 center, with white ^n^ on a pearl-coloured ground extending 

 from it to the circumference, is fometimes found in limeftone 

 in the quarry at C%r-grange, near Stamfordham, from which 



I had 



