t.musc 



gon.c 



t.musc 



FK;. 440. Illustrating the development of the genital organs of Amphioxus lanceolntus. 



( After Boveri. ) 



A, a portion of the body-wall of a young Amiiliio.rti.i, 9 millimeters long, viewed as a transpaient 

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

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

 small portion ol' a similar preparation from a slightly older specimen than that from which li is taken, 

 In slio\v the indentation of the wall of the myotome by the genital rudiment. I"), a small portion of a 

 similar preparation from a specimen 14 millimeters long to show the formation of the gonocnele from 

 the myocoele. K, a. portion of a transverse section through a specimen of the same size as that from 

 which' I) is taken. </''''', primitive germ cells ; i/an, rudiment of genital organ ; i/ox.r, gonocoele ; mil, 

 myotome; /.</.<, myocoele; scl 2 , lower sclevotome ; sri>t, septum, dividing gonocoele I'rom myocoele ; 

 Linn*-, transverse muscle in the floor of the a trial cavity. 



602 



