FIG. 94. Sketch of triple monster trout embryo described on pp. 33, 34, as 

 seen from the left side of the principal embryo. Between the latter and 

 embryo A are two vents close together, while the single urinary pore is 

 behind the vents. A marked keel along the left side of the composite tail is 

 formed by fusion of the ventral edge membranes of these two embryos. A 

 similar keel occurs along the right side, and is derived from the fusion of 

 corresponding elements belonging to the principal embryo and to embryo B. 

 The lower angle of the composite tail is formed by the fusion of the dorsal 

 edge membranes of A and B. The specimen is also illustrated in the two 

 succeeding figures and in PI. VII. figs. 32-^4, and PI. XXIII. figs. 97-09. 

 (x6.) 



'An/i it W/io / 



FIG. 95. Diagram of alimentary canals of the triple monster illustrated 

 above. The whole canal of the principal embryo is quite separate from the 

 canals of the other two, and has its own air-duct, air-sac, liver and bile-duct. 

 The two defective embryos have the anus and last part of the intestine in 

 common, but their gullets, stomachs, first portions of intestine, and liver out- 

 growths are separate. Other references are given under Fig. 94. 



JluJ.-mJ 



FIG. 96. Diagram of the urinary apparatus in the triple monster. The 

 head-kidneys and, for the greater part of their length, the Wolffian ducts are 

 separate, but there is only a single bladder and urinary pore. The left duct 

 of the principal embryo, and the right duct of embryo . /, unite before opening 

 into this bladder, as also do the left duct of.-/, and the right duct of B. The 

 left duct of B ends blindly. Other references are given under Fig. 94. 



J. F. G. 



PI,. XXII. 



