1903.] 



MONSTROSITIES IN FISHES. 23 



Plate III. 



Fig. 18. Diagram of heart ^c. of normal Trout embryo. Lettering as in fig. 20. 

 Fig. 19. Diagram rf heart Sfc. of the monstrosity illustrated in figs. 5, 6, 10, andl& 



(p. 15). Lettering as in fig. 20. 

 Fig. 20. Diagram of heart of the monstrosity referred to on p. 16, 

 V. Ventricle. 

 All. Auricle. 

 8V. Sinus venosus. 

 DC. DuctofCuvier. 

 DC'. Inner or adjacent ducts of Cuvier. 

 VJ. Jugular vein. 

 VC. Cardinal vein. 

 VC. Inner or adjacent cardinal veins. 



Jian duct tf- iirinary bladder of a normal Trout embryo (p. 7). 



Lettering as in fig. 26. 



„ „ in the monstrosity referred to on 



p. 16. Lettering as in fig. 26. 



„ „ in the case refeiTed to on p. 17. 



Lettering as in fig. 26. 

 „ „ in the case referred to on p. 17. 



Lettering as in fig. 26. 

 „ „ , in the case referred to on p. 17. 



Lettering as in fig. 26. 

 „ „ in the case referred to on p. 18. 



Bladder. 

 Bladder formed by the inner or adjacent pair of Wolffian 



ducts. 

 Wolffian duct. 

 Eight and left Wolffian ducts belonging to one of the twins 



in each of the figm-es. 

 Left and right Wolffian ducts belonging to the other twin 



in each of the figures. 

 Intestine. 

 Rectum. 

 Vent. 

 Urinary pore. 



Plate IV, 



Fig. 27. Lateral vietv of the composite auditor^/ sac present in the monstrositj'^ 

 illustrated in figs. 5, 6, 10. (See pp. 11, 13.) 

 Sacc. Saccule. 

 Utr. Utricle. 



a.sc. An anteriorly placed semicircular canal. 

 psc. A posteriorlj'^ „ „ 



Fig. 28. Diagram of head-Tcidney 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. 

 SK. Coils of Wolffian duct in head-kidney. 

 Fig. 29. Composite head-kidney in a double monstrosity (p. 10). Lettering as in 

 fig. 28. 

 Two glomei'ular tufts are present in a cavity divided into three chambers. 

 O. Mesial chamber. 

 Fig. 30. Sead-kidney in a double monstrosity of same general tj'pe 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 duct*. 



