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XXII. j^ccount of the Flujlra Arenofa, and fome other Marine ProduSlions. 

 By Henry Boys, Efq. F.L.S, 



Read June 4, 1799. 



FLUSTRA arenoja. 



Fl. cruftacea arenofa lutofa, poris fimplicibus fubquincuncialibus. 

 Ellis Zooph. p. 17. «. 10. Gtnelin Syjl. Nat. v. i. 3829. Pallas 

 El. Zooph. p. SI' «• 5" ■^'^'^" Cor all. p. 74. ^. 25. y: c. Rati 

 Syn. p. 31. 



Englifti Sea Mat. 



I 



Tab. X. 



T may not be improper to tranfcribe Mr. Ellis's account of this 

 produdlion. 



" This fea mat is formed of fand and flime into a cruftaceous 

 body, with fmall mouths placed almoft in a quincunx order." 



" This was fent me from Holyhead in Wales. Its form, when 

 intirc, was exadlly like the upper femicircular 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 



4 the 



