OF 



PI XXII 

 i n the study o 



trout ambry o, and of speciu 

 i double monstrosity. 



tit embryo at the same 



nent as the monstrosities described. 



us, etc., of the latter, shown in 



utal sections of normal trout embryo, as above. 



i: also PI. Vll. figs. 30-31. 

 Transverse sections of double monsters with union in the 

 posterior part of th ss VI. (a) and (?<)). 



PL VII. figs. 32-34. 



Tiansverse sections through the triple monster described 

 on pp. 33-34 ; see also Pis. XXII. -XXIII. figs. 94-99. 



■ Ira wings made 

 aid figures 



pie from Class IV. 



i' fins being present 



llustrate the 



double 







sented) o 



oral lins being present I 

 illustrate the posterior ends < 



bladders and urinary pores in a normal embryo and in 

 double monsters belonging to Classes V. and VI. (union 

 by the body or tail). 



i 87. 

 Fig. 82 shows the inner-composite otocyst in^a do 





III. a 



id of the medulla 



B II.). 



P!s. XV. -XVI. figs. 52-o5. 



Horizontal sections of a double monster with union in 

 the pectoral region, inner pectoral fins not being present 

 (Class II . 



lernal appearance and the 

 id urinary structures of the triple monster 

 iii. 33, 34. 

 PI: XXIII. figs. 97-99. 



Transverse sections of the body of the triple monster ; 

 see also PL VII. figs. 32-34. 

 PL XXIV. figs. 100-106. 



■es illustrate c 







