10 Microscope Slides: 1(f). Botryllus schlosseri, tunicate colony, w.m. 2(e). Clavelina, tunicate, l.s. showing gill, intestine, gonads 3(d). Clavelina, t.s. region of gills and intestine 4(f). Balanoglossus, t.s. region of gonads 5(d). Sagitta, arrow worm, w.m. 6(f). Branchiostoma (Amphioxus), adult specimen, w.m. 7(f). Branchiostoma, larva, w.m. 8(d). Branchiostoma, t.s. region of gills and intestine 9(d). Branchiostoma, t.s. region of intestine and liver 10(d). Branchiostoma, head region, t.s. showing light sensitive pigment cells.
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