. Comparative anatomy. Anatomy, Comparative. 334 COMPARATIVE ANATOMY gill bars thus formed become interconnected by cross rods or synapticulae such as occur also in urochordates and cephalochordates. In urochordates, the number of gill slits varies from a single pair in Appendicularia to the many characteristic of most genera. The gill slits of this group open into an atrial cavity developed by an ectodermal ingrowth along the dorsal side of the body. ANTERIOR CAVITY MYOTOME 2 CHORDA ENTERON. MOUT ENDOSTYLE LEFT 1ST (TRANSIENT)GILL-POUCH CLUB-SHAPED GLAND A. EARLIER LARVA. ENDOSTYLE RIGHT 1ST
. Comparative anatomy. Anatomy, Comparative. 334 COMPARATIVE ANATOMY gill bars thus formed become interconnected by cross rods or synapticulae such as occur also in urochordates and cephalochordates. In urochordates, the number of gill slits varies from a single pair in Appendicularia to the many characteristic of most genera. The gill slits of this group open into an atrial cavity developed by an ectodermal ingrowth along the dorsal side of the body. ANTERIOR CAVITY MYOTOME 2 CHORDA ENTERON. MOUT ENDOSTYLE LEFT 1ST (TRANSIENT)GILL-POUCH CLUB-SHAPED GLAND A. EARLIER LARVA. ENDOSTYLE RIGHT 1ST PERMANENT GILL-SLIT. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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