. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Uromelia. Sympodia. posed of the elements of two, and arti- culates with a pelvis, which is not formed, as in monopodia, by one bone, but by a coalescence of two. In most of them the partially double, partially single inferior ex- tremity terminates in a caudal point ; on account of which the name of Sirencs has been adopted. To this imperfection are added closed anus, defect of external genital parts, and the existence of but one artery in the umbilical cord. The malformed inferior ex- tremity has not always the same fo
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Uromelia. Sympodia. posed of the elements of two, and arti- culates with a pelvis, which is not formed, as in monopodia, by one bone, but by a coalescence of two. In most of them the partially double, partially single inferior ex- tremity terminates in a caudal point ; on account of which the name of Sirencs has been adopted. To this imperfection are added closed anus, defect of external genital parts, and the existence of but one artery in the umbilical cord. The malformed inferior ex- tremity has not always the same form. There- fore we admit three varieties:—1. Without a foot, Sirenomelia of J. G. St. Hilaire; 2. With a single foot, more or less complete, Uromelia of J. G. St. Hilaire; 3. With a double foot. Fig. 622. represents the second, and Jig. 623. the third variety. By this survey of the four types of de- fective formation of the trunk is proved that they form a very natural series, in which we are gradually inducted, from the total want of a trunk to monsters in which inversion of the inferior extremities is the only deviation from the natural form. The same regularity is here to be observed as in every other class of monstrosities. It is therefore impos- sible to ascribe their origin to accidental ex- ternal causes. Meckel has opposed his own. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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