Homotrophe

In biology, one of two or more homologous parts or organs the structural correspondences of which are due to corresponding internal, modifying conditions, rather than to external environment. I. Serial Homotrophes, i. e., homo trophic homologues, the correspondence between which is anteroposterior, e.g., an extra thumb and an extra great toe on the same side of the body. 2. Vertical Homotrophes, i. e., homo trophic homologues that correspond vertically. 3. Lateral Homotrophes, i.e., homo trophic homologues of the two sides of one individual, e. g., the right and left eyes. 4. Antero-posterior Homotrophes, i. e., homo trophic homologues that correspond antero-posteriorly. (St. Geo. Mivart.) Hook A curved instrument. See Hamus . H., Blunt, an instrument described by its name, for exercising traction upon the fetus in an arrested breech-presentation. H., Tyrrel's, a blunt, slender hook lor operations upon the eye. Hooke's Law. See Law.