. A manual of elementary zoology . Zoology. THE LANCELET 333 ventral wall is formed by a longitudinal bar, known as the endostyle, with which the lower ends of the gill bars are ,-tmym. -nch. â Fig. 241.âA transverse section of Amphioxus in the region of the intestine. , Connective tissue sheath of the notochord ; coeL, caelom; , dorsal aorta; , dorsal fin ray ; , dorsal root; int., intestine; mym., myomeres ; , nerve cord ; nch., notochord ; fir. at., backward prolongation of the atrium ; subintestinal vein (here represented Ivy several vessels);

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. A manual of elementary zoology . Zoology. THE LANCELET 333 ventral wall is formed by a longitudinal bar, known as the endostyle, with which the lower ends of the gill bars are ,-tmym. -nch. â Fig. 241.âA transverse section of Amphioxus in the region of the intestine. , Connective tissue sheath of the notochord ; coeL, caelom; , dorsal aorta; , dorsal fin ray ; , dorsal root; int., intestine; mym., myomeres ; , nerve cord ; nch., notochord ; fir. at., backward prolongation of the atrium ; subintestinal vein (here represented Ivy several vessels); , ventral fin ray. fused. This bears a groove lined by ciliated cells with two longitudinal bands of gland cells on each side. These cells secrete mucus which is passed outwards by the cilia. At the. 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920