Experimental Studies on Germinal Localization. 25 



Fig. V. 



Normal Mefamorpliis and lobeless Larvae. 



(Excepting Fig. 33 these figures were drawn from living larva, the cilia 

 being added from formol preparations and the inner outlines from specimens 

 mounted in balsam.) 



29, Normal trochophore of 24 hours (a rather large specimen) ; 30, normal 

 trochophore of 32 hours; 31, normal larva of 72 hours, showing foot and shell; 

 2)2, larva of 24 hours, after removal of first polar lobe ; 33, vertical section of 

 lobeless larva of 24 hours, showing entoblast-plug protruding through the 

 blastopore; 34, larva of 72 hours, after removal of first polar lobe; 35I larva of 

 24 hours, produced from a form like Fig. 28, after removal of about half the 

 polar lobe ; 36, larva of 24 hours, after removal of second polar lobe ; 37, CD 

 half-larva, after removal of second polar lobe, 24 hours. 



1 This figure has been turned upside down by the engraver. 



