The major organisms involved in the Algal Study are: Interomorpha intestinalis, Chondrus crispus, and Littorina littorea.  Each can be found in their separated groups and below.

Interomorpha intestinalis

The green plant like in this tide pool is the Interomorpha.  This algae is bright grass-green and unbranched, resembling loosely tangled fishing line; in tide pools, middle to low and subtidal zones.

Chondrus crispus

This easily identified algae is the Chondurs crispus, :-).  The Chondrus crispus has flattened, dichotimously branched thallus.  Collor ranges from dark red to olive-green to gold.  It grows in masses on rocks. 

Littorina littorea

The Littorina Littorea is the common periwinkle.  It is a thick, round, smooth snail.  Its shell grows to 1.25" and its color varies from dark gray, olive, to brownish black.  The lip of the apertual lip projects towards the spire.  They are herbivores that graze on algal films.  This species was introduced to this Atlantic shore from Europe certainly by mid-1800s.