3222. Acrania and Tunicata. 14 Color Photomicrographs. 1. Branchiostoma lanceolatum (Amphioxus), w.m. adult 2. Ditto. w.m. young larva 3. Ditto. anterior end of adult l.s. 4. Ditto. mouth region t.s. 5. Ditto. anterior pharynx t.s. 6. Ditto. t.s. of male