F LUSTRA. 17 



10. Fluftra arenofa, Sandy Sea Matt. 



Fluftra cruftacea are- , This Sea Matt is formed of 

 no/a lutofa> ports Jimpli- fand and flime into a crufta- 

 cibus fubquincwicialibus . ceous body, with fmall mouths 



placed almoft in a quincunx 



order. 



Englifi fandy Millepora. Ellis Corallin. pag. 74. 

 tab. 25. fig. e. 



This fandy Sea Matt, of which but a fmall part is 

 drawn at fig. e. tab. 25. EfTay on Corallines, was fent 

 me from Holyhead, in Wales. 



Its form, when intire, was exactly like the upper femi- 

 circular part of a colt's hoof. The furface of each of the 

 cells was a little hollow in the middle, with a fmall hole 

 in each : from the appearance it made, when I received it 

 intire, I judged it to be what Imperatus calls his Lorica 

 Marina. 



There is a layer of fand and flime under as well as over 

 the cells which compofe it. It is very friable when dry. 



Whether it belongs to this genus or not, I fubmit to 

 the curious. 



11. Fluftra tubulofa. Pipy Sea Matt. 



Fluftra adnata mem- Membranaceous adhering 



branacea^ cellulis jimpli- Sea Matt, with a fingle layer 



cibus ovato-oblongisy ofcu- of oblong-oval cells, and a 



lis tubulofis ere&is* tubulous erecl; opening to each. 



This Sea Matt was fent by Mr. Greg, among many 

 other curious fea productions, from Dominica, adhering 

 to a fucus, and differs from all the reft of this genus, in 



D having 



