They pump water through the incurrent aperture, obtaining oxygen and food.

A mussel draws water in through its incurrent siphon.

Anything that is small enough to fit inside the hole of its incurrent siphon enters the bivalve.

It is estimated that water enters through more than 80,000 incurrent canals at a speed of 6 cm per minute.

Clams filter feed by drawing in water containing food using an incurrent siphon.

Each clam then fills its water chambers and closes the incurrent syphon.

Any undesirable particulate matter is bound with mucus, known as pseudofeces, and ejected out the incurrent siphon.

Each nostril is divided into a very large incurrent opening and a small excurrent opening by a triangular skin flap.

The gill cilia draw in water through the incurrent chamber and run posteriorly in the excurrent stream where they are discharged.

The nostrils are sizable and divided by well-developed lobes of skin on the anterior margins; the incurrent openings are tubular in appearance.

There is an inhalant or incurrent siphon, and an exhalant or excurrent siphon.

It uses its cilia to pull water into its shell cavity through an incurrent siphon and it is here that desirable particulate matter is removed.

The smaller, more prevalent incurrent pores are the ostia and the larger excurrent pores are the oscula.

There are well-developed skin flaps and grooves around the incurrent nostril opening, as well as a pair of grooves connecting them to the small, almost transverse mouth.

A furrow encircles the incurrent opening and another furrow runs from the excurrent opening to the mouth, which is located nearly at the tip of the snout.

The nostrils are placed almost at the tip of the snout and have long, tapering barbels in front and well-developed skin flaps and grooves around the incurrent openings.

Bivalves have two siphons or apertures at the posterior edge of their mantle cavity: an inhalant or incurrent siphon, and an exhalant or excurrent siphon or aperture.

The nostrils are divided into incurrent and excurrent openings by long flaps of skin that reach the mouth; the incurrent opening is encircled by a groove while another groove runs from the excurrent opening to the mouth.