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Show 1903.] MOXSTROSITIES IX FISHES. 23 PLATE III. Fig. 18. Diagram of heart Sfc. of normal Trout embryo. Lettering as in fig. 20. Fig. 19. Diagram of heart tye. of the monstrosity illustrated in figs. 5, 6,10, and 16 (p. 15). Lettering as in fig. 20. Fig. 20. Diagram of heart of the monstrosity referred to on p. 16. V. Ventricle. Au. Auricle. SV. Sinus venosus. DC. Duct of Cuvier. DC. Inner or adjacent ducts of Cuvier. VJ. Jugular vein. VC. Cardinal vein. VC. Inner or adjacent cardinal veins. Fig. 21. Diagram ofWolffian duct Sf urinary bladder of a normal Trout embryo (p. 7). Lettering as in fig. 26. Fig. 22. „ „ „ in the monstrosity referred to on p. 16. Lettering as in fig. 26. Fig. 23. „ „ „ in the case referred to on p. 17. Lettering as in fig. 26. Fig. 24. „ „ „ in the case referred to on p. 17. Lettering as in fig. 26. Fig. 25. „ „ „ in the case referred to on p. 17. Lettering as in fig. 26. Fig. 26. „ „ „ in the case referred to on p. 18. BL. Bladder. BL'. Bladder formed by the inner or adjacent pair of Wolffian ducts. WD. Wolffian duct. WDb, WDb'. Eight and left Wolffian ducts belonging to one of the twins in each of the figures. WDa, WDa'. Left and right Wolffian ducts belonging to the other twin in each of the figures. Int. Intestine. R. Rectum. V. Vent. P. Urinary pore. PLATE IV. Fig. 27. Lateral view of the composite auditory sac present in the monstrosity illustrated in figs. 5, 6, 10. (See pp. 11, 13.) Sacc. Saccule. Utr. Utricle. a.sc. An anteriorly placed semicircular canal. psc. A posteriorly „ „ Fig. 28. Diagram of head-kidney of a normal Trout embryo (p. 7). GL. Glomerular tuft of vessels. A. Afferent vessel. V. Efferent vessel. C. Capsule of glomerulus. CWD. Commencement of Wolffian duct WD. HK. Coils of Wolffian duct in head-kidney. Fi°- 29. Composite head-kidney in a double monstrosity (p. 10). Lettering as in fig. 28. Two glomerular tufts are present in a cavity divided into three chambers. O. Mesial chamber. Fig. 30. Head-kidney in a double monstrosity of same general type as last, but here the glomeruli have not united together, though the adjacent halves of each give origin to no Wolffian duct or only to a short blind one (p. 10). Lettering as in fig. 28. Figs. 31 & 32. Head-kidney glomeruli of other two double monstrosities showing a degree of duplicity greater than that illustrated in fig. 29 (pp. 14, 16). A blind sacculated tube comes off from the middle compartment of the composite glomerulus and represents united adjacent Wolffian ducts. |