. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. SKELETON. CYCLOSTOMES have a persistent notochord, increasing in size with the growth of the animal, and lacking constrictions since no centra are developed. In the myxinoids there are neurapophyses and intercalaria developed in the caudal region; in the lampreys they occur in the trunk as well. FISHES.—In the elasmobranchs the typical vertebras are developed in cartilage, with intercalaria in connection with the arches. Usually the centra undergo more or less calcification (p. 43), the lime being either deposi
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. SKELETON. CYCLOSTOMES have a persistent notochord, increasing in size with the growth of the animal, and lacking constrictions since no centra are developed. In the myxinoids there are neurapophyses and intercalaria developed in the caudal region; in the lampreys they occur in the trunk as well. FISHES.—In the elasmobranchs the typical vertebras are developed in cartilage, with intercalaria in connection with the arches. Usually the centra undergo more or less calcification (p. 43), the lime being either deposited in concentric rings around the notochord (cyclospondylous vertebrae) or in radiating plates (astero- spondylous). In the trunk region each centrum often bears a pair of transverse processes with short ribs at their extremities. In a few forms (skates, etc.) embolomerism (p. 48) occurs in the tail, and in the holocephali the centra are replaced by numerous rings of cartilage. In skates and in Chinuzra there is a true joint between the skull and the column, but in the sharks the anterior vertebrae are fused together and to 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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