SEA MUSSEL, MYTILUS EDULIS. 



141 



PAd Coe 



120 



Fig. 119. — Anterior view of mouth showing relation of lips to labial palps. ILP, inner labial palp; Mth, mouth; OLP, 

 outer labial palp. 



Fig. 120.— Digestive organs dissected out and shown in side view. A Ad, .interior adductor muscle; -In. anus; A Ret, anterior 

 retractor muscles; Br, gills; By, byssus; Coe, coecum of the crystalline style; Dl. direct intestine containing the crystalline 

 style; Ft, foot; L, liver; Mes, mesosoma; Ocs, cesophagus; PAd, posterior adductor muscle; PRet, posterior retractor muscle; 

 RI, recurrent intestine; St. stomach; 77, terminal intestine. 



90392°— 22 2 



