▁d ors al ▁margin . ▁The ▁outer ▁surface ▁of ▁the ▁shell ▁is ▁dark ▁brown , ▁while ▁the ▁inside ▁of ▁the ▁val ves ▁is ▁blue ▁or ▁slightly ▁ir ides cent ▁gray . ▁These ▁muss les ▁are ▁character ized ▁by ▁a ▁peri ost rac um ▁with ▁long , ▁st iff , ▁flat ▁br ist les . ▁They ▁are ▁attached ▁with ▁strong ▁by ss us ▁to ▁the ▁under ground . ▁ ▁Distribution ▁and ▁Hab itat ▁This ▁species ▁ ▁is ▁present ▁from ▁the ▁Mediter rane an ▁Sea ▁to ▁the ▁Black ▁Sea , ▁on ▁the ▁southern ▁and ▁western ▁coast s ▁of ▁Great ▁Britain ▁and ▁Ireland ▁and ▁along ▁the ▁Atlantic ▁coast ▁of ▁Mor oc co . ▁It ▁inhab its ▁in ▁large ▁communities ▁on ▁rocks ▁and ▁stones ▁the ▁coast al ▁marine ▁environments ▁at ▁depth s ▁of ▁ 5 ▁to ▁ 1 1 0 ▁m . ▁ ▁Human ▁use ▁The ▁be arded ▁horse ▁muss els ▁are ▁har v ested ▁for ▁human ▁consumption ▁from ▁their ▁natural ▁b eds , ▁together ▁with ▁My til us ▁gal lo pro vin cial is . ▁ ▁References ▁ ▁bar b atus ▁Category : M oll us cs ▁described ▁in ▁ 1 7 5 8 <0x0A> </s> ▁Instituto ▁Esc uela ▁can ▁refer ▁to : ▁ ▁Instituto ▁Esc uela ▁del ▁Sur , ▁a ▁private ▁middle ▁school ▁and ▁high ▁school ▁in ▁T l al pan , ▁Mexico ▁City ▁ ▁U . E . ▁Instituto ▁Esc uela ▁( Car ac as ) ▁ ▁Instituto ▁Esc uela ▁( Mad rid ) <0x0A> </s> ▁N ay den ▁Apost ol ov ▁( ▁Naj