University of California
Ucmp: Introduction to the Cephalochordates & Lancelets
This site describes the lancelets and the characteristics of chordates they express.
McGraw Hill
Glencoe Biology: Invertebrate Chordates: Self Check Quiz
This multiple-choice quiz on invertebrate chordates allows students to get hints for each question and check their answers after submitting.
California Academy of Sciences
California Academy of Sciences: Echinoderm Webpage
Resource provides a brief overview of echinoderms. Includes pictures and links for more information.