DEVELOPMENT OF APYRENE SPERMATOZOA. 



325 



14- 



l-'ir.s. 10 to 14. Initial magnitii ation of 3.450 diameters, reduced "ii<- tliird. 



in t<> 13. vatiou- -tages in the lutrr d<-\ rl< .pment nf tin- apyn-nr -p.-nnai 

 of Strombus bitubcnnliitus. Fig. 10, bundle of axial fibers beginning to split; a ir\v 

 albuminous bodif~. not figured, havr IH-.-II lorun-d in th- ant>-ri, a i-oition oi tin- 

 cell. I'i.i;. ii -how- the completed splitting of the Imndl of axial Iil>i-i-; the cell 

 i- not cut through it- h. l-"ig<. u and 13 are section- through two 



neatly adult -pet tnato/oa. Fig. 14 is a nurse-cell of Littorina n?t>ul<>sa still attached 

 to the \\all of tin- tCStia; the <talk wa< about tO ! severed iu-t lielow tin- d> 

 eiating nucleii-. 



