. A manual of zoology. 362 MANUAL OF ZOOLOGY is in some respects-extremely primitive. The spinal col- umn is represented merely by a thick persistent notochord, enclosed in a sheath, with, in the lampreys, small carti-. Fig. 222. — Head of Myxine glutinosa (A) and of Bdellostoma forsteri (B), from beneath, br. ap, branchial aperture; br. cl. /, first branchial cleft; jnth, mouth; tta. ap, nasal aperture; oes. ct. d, cesophageo-cutaneous duct. The smaller open- ings in A are those of the mucous glands. (After W. K. Parker.) laginous processes representing neural and haemal arches. The
. A manual of zoology. 362 MANUAL OF ZOOLOGY is in some respects-extremely primitive. The spinal col- umn is represented merely by a thick persistent notochord, enclosed in a sheath, with, in the lampreys, small carti-. Fig. 222. — Head of Myxine glutinosa (A) and of Bdellostoma forsteri (B), from beneath, br. ap, branchial aperture; br. cl. /, first branchial cleft; jnth, mouth; tta. ap, nasal aperture; oes. ct. d, cesophageo-cutaneous duct. The smaller open- ings in A are those of the mucous glands. (After W. K. Parker.) laginous processes representing neural and haemal arches. The skull is cartilaginous, and is peculiarly modified. Be- hind it in the lamprey is a remarkable basket-like apparatus,. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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