(3 hours) Prerequisite: BIOL 162 and 162L with a grade of “C” or better in both. Corequisite: BIOL 201L. A systematic coverage of invertebrate organisms from protozoa to the cephalochordates. Morphology, physiology, ecology and taxonomic relationships are stressed. Special emphasis is placed on marine invertebrates. Lecture 3 hours. This course cannot be challenged.