132 M I L L E P O R A. 



of Cornwall. It is extremely thin and brittle : the ferni- 

 circular plates are of various fizes, and conftantly grow 

 horizontally ; their margins bend over, which makes 

 them convex on their upper fides, and concave under- 

 neath. This is remarkably full of the fame fhaped ova- 

 ries with the Coralline of the Shops. My learned and 

 reverend friend Dr. William Borlafe, of Ludgvan, in 

 Cornwall, was fo kind as to fend me many varieties of 

 this fpecies. The pores on the under part are to be dis- 

 covered by good glafTes. The cellular ftructure of the 

 internal part both of this and the officinal Coralline exact- 

 ly agree, as may be feen in the figures I have given of 

 them. 



[2]. MlLLEPORES THAT GROW LIKE THE FLUSTRA. 



5. Millepora Spongites. Spo?tge-Stone Millepore. 



Millepora fragilijfima^ This very brittle Millepore 



cellulis feriatis^ la?nellis has rows of cells, in fingle 



Jimplicibus tubulofo-turbi- layers, which are of a tubular 



natis varie coalefcentibus. top-fhape, irregularly uniting 



together into maffes. 



Cellepora Spongites. Linn. Syft. Nat. Ed. 12. p. 1286. 



This delicate Millepore is marked on the under fide of 

 the cells with lines between each row ; the openings of 

 the cells have a little margin round them, and there are 

 frequently little round balls on the upper part of many of 

 them, which probably are their ovaries. The cells in 

 their lines are generally alternate to thofe that lie next to 

 them. It is found in the Mediterranean Sea, of various 

 fizes, from two to four inches diameter, and often much 



larger 5 



