07 



filent, and we trufl by the figure here given of a fpecimen of 

 fuch fuperior growtli, no doubts will in future obtain even by 

 thofe wlio may not have had an opportunity of comparing 

 the real fliells. 



The Mytitus dlfcrepans is in no inflance found to inhabit tlia 

 Afcidiii Mcntula ; and the M. difcors is rarely found except 

 bedded in the exterior coat of that animal, or fome of the 

 larger Fuci : on the wellern coaft iome AJlidia are fo ftudded 

 with them as nearly to cover the whole furface ; twenty or 

 thirty may fometimes be counted in an old corrugated fpe- 

 cimen, and it is in thofe AJcidia only they make a lodgment, 

 or are found of fuperior fize. If the comparative defcription 

 before given is confulted, no milfake can happen in identi- 

 fying the fpecies. 



; i ■ 

 It has been faid that the foreign difcon are always found 



in clufters, enveloped in a yellowifli filky byjjfns; but no fuch 



inflance has ever occurred to us or our friends in the BntijJj 



fpecimens. It has fometimes occurred fixed in the ftalks 



and roots of Fucus digitatus, upon the Weftern fhores, and 



we are informed it is commonly found in that fituation in 



Scotland. 



Thofe who have an opportunity ofconfulting Chemnitz 

 will find in Vol, viii. Tab 86. fig. 767, a good reprefentation 

 of a large fpecimen of Mytihis dijcrepans, which exactly ac- 

 cords with thofe found in SeoiUmd. That conchologill has 

 like fome others confounded it with M. difcors, and has given 



12 it 



