173 



PoflTibly it has been confounded with that fhell, hut we 

 never found it except at the place before mentioned. It 

 is not in general fo thin as the preceding fpecies; in fliape 

 correfponds very well with Lister's figure of the flTell 

 here quoted, but jn general is more ftrait on the front 

 margin, ciofe to the pollerior fide^ and frequently makes, 

 an angle at that part. 



15. 

 Mytilus ftriatus umbonibus produflls. JValk. Min. Shells, f.75. Striatus. 



The ftriated mufcle with lengthened beaks. 



The colour pellucid white. From Recidver and Sand- 

 zoich not uncommon. Minute. 



We are not quite certain, that this fpecies defcribed by 

 Mr. Walker has ever come under our infpettion; but have 

 fometimes met with a fliell, not very unlike the figure 

 given, except that it had not any confpicuous longitu- 

 dinal Itriae, and which we have confidered as the fry of the 

 M. Modiolus, or M. curtus. 



We (hall here take the liberty of remarking, that very- 

 great attention is requifite to difcriminate fome of the 

 minute bivalve [liells, and feparate them from the bivalve 



Monoculi. 



The great affinitv that the coverings, or fliells, of fome 

 of this clafs of infects, bear to the teftacea tribe, has in all 



probability 



