no SHELLS. Class VI. 



MfriLUSr XV. Its animal an Ascidja. 



Bivalve ; often affixed to fome fubftance by 

 a beard. 



Hinge without a tooth, marked by a longi- 

 tudinal hollow line. 



Rugofus. Lin. Sjft. 1156. No. 249. Lift. Angl. tah. lv,ftg. 21. 



72. Rugged* 



M. with a brittle (hell, very rugged, and in fhape 

 moft irregular j ufually oblong, and rounded at 

 the ends. 



Length near an inch. Color whitifh. 



Always found lodged in limeftone. The outfide 

 generally appears honey-combed *, but the apertures 

 are too fmall for the (hell to pais through, with- 

 out breaking into the cell they are lodged in. 

 Multitudes are found in the fame (lone : but 

 each has a feparate apartment, with a different ex- 

 ternal fpirack. 



Tab, lxiii. fig. 72. 



Eduiis. Lin. Syjl. 1157. Ko. 253. Faun. Suec. No. 2156. Lift. Angl. 



73. Edible. tab. iv. Jig. 28. 



M. with a flrong (hell, (lightly incurvated on one 

 fide : angulated on the other. The end near the 



hinge 



