. The chordates. Chordata. Mouth Anus Intestine i Stomach ^•y "SSSS Fig. 310. Doliolum, a free-swimming tunicate. The somewhat diagrammatic figure, taking advantage of the fact that the thin body-wall of the small animal is semitransparent, assumes that the main features of internal structure may be seen through the outer wall. The many branchial slits (stigmas) through which water passes from the pharynx into the atrial cavity are not shown, but are suggested by arrows. The animal's swimming movements are effected by contractions of the circular Fig. 311. Appendicularia (Fritil
. The chordates. Chordata. Mouth Anus Intestine i Stomach ^•y "SSSS Fig. 310. Doliolum, a free-swimming tunicate. The somewhat diagrammatic figure, taking advantage of the fact that the thin body-wall of the small animal is semitransparent, assumes that the main features of internal structure may be seen through the outer wall. The many branchial slits (stigmas) through which water passes from the pharynx into the atrial cavity are not shown, but are suggested by arrows. The animal's swimming movements are effected by contractions of the circular Fig. 311. Appendicularia (Fritil- laria) fwcata, from the ventral surface. (a) Anus; (gl) unicellular glands; (gs) gill-slits; (h) dorsal hoodlike fold of integument; (m) mouth; (/) tail. (After Lankester. From Willey: "Am- phioxus and the Ancestry of the Verte- ; By permissionof The Mac- millan Company, publishers.) w. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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