Species attached and projecting from soft bottoms.

Modiolus americanus:

Sand or Tulip Mussel. Up to 10 cm long, the anterior end is short and narrow, posterior end broadly rounded. Beaks anterior, not terminal. Shell is rather thin in substance and is also moderately inflated. Surface is smooth, periostracum glossy. Colour: yellowish brown, with a purplish interior. Occurs attached in sea grass beds in moderately shallow water.