A flat nemertean found under shells and rocks in shallow water. Four species in our area distinguished by color. Lenths range from 2 to 6 inches but all are quite narrow. Striped Lineus is green with a median stripe. Sandy Lineus is rose colored. The social Lineus is dark green/red and contracts in coils sometimes with several individuals in a coiled mass. the Red Lineus looks similar but does not coil.