tmusc 



gon.c 



t.musc 



FIG. 440. Illustrating the development of the genital organs of Amphioxus lanceolatus. 



(After Boveri.) 



A, a portion of the body-wall of a young Amphioxus, 9 millimeters long, viewed as a transparent 

 object, in order to show the relation of the genital rudiment to the myotomes. B, a small portion of a 

 similar preparation from a still younger specimen, in order to show the origin of the germ cells. C, a 



Mie myocoeie. Hi, a portion 01 a transverse section uiiougn a specimen 01 me same size as tiuto irom 

 which D is taken, germ, primitive germ cells ; gon, rudiment of genital organ ; gon.c, gonocoele ; my, 

 myotome ; my.c, myocoeie ; scl 2 , lower sclerotome ; sept, septum, dividing gonocoele from myocoeie ; 

 t.musc, transverse muscle in the floor of the atrial cavity. 



602 



