272 EMBRYOLOGY OF THE LOWER VERTEBRATES < n. 



Rana tewjKinii-ia Bouin) the total number of gonocytes in the 

 gonad undergoes a remarkable reduction, e.g. from between 200 and 



som. 



ffc. 



Fl.. 111. I)\i-lij.iiiriit of the -.in.'i.l in Ainpliiliia as srcn in transverse sections. 

 (A, .-Ht.-r SrliHi.it/, I'.Mii; li K, after Bouin, 1901.) 



A, lai\a ot A\"l"ll (.!, ma) ; H. lM nun. t;i.l|'..|,- ; C. -.'I nun. t;i.l|.ol> ; 



in. l.-i'tpol.- ; K. .r, nun. ta<l|Hili- with liiii'l l.-s . >in|il<-( ,-l\ <li-\ .|o|,.-,l. /,,/. iiiicl.-ns nf tollicle- 



<^11 J g.f, -'-nital )" ! ./.I. | laiiMtional sta.yt's sliouniv run \ c -i >u >\\ 



of appai'-iUh inilillfifiil r.ll iiyinc; M-//I, nomalir nn'sn.lci in ; -]'/, 



>|.l!iiii-linic IIJ.-MX|-!-III ; .//, yolk. 



250 in a frog tadpole nl L'<; nun. t. II-|\\(H;II 37 and I<1 in a tadpole 



nf ?>'.', nun. r.nuin . Curing this process indi\idual gonooTtee 



