2/8 JOHANNA M. DIECKMANN. 



PLATE II. 



FIG. 12. Spermatheca at a level mid-way between the levels of Figs. 4 and 5, 

 on Fig. ii. Shows the common tube at its point of junction with its two branches, 

 tubules streaming laterally and ventrally, pigment surrounding tubules, sperma- 

 tazoa in tubules. (Magnification approximately X 47.) 



FIG. 13. Single tubule, showing sperms arranged in whorls. ( X 97.) 



FIG. 14. Cloaca of female Gyrinophilus larva of 8.8 cm., showing median dorsal 

 fold. (Approximately X 33.) 



FIG. 15. Same animal; more caudal level than Fig. 14; showing thicker 

 epithelium, with well-defined row of basal nuclei and basement membrane. ( X 33-) 



FIG. 16. Cloaca of larva of 10.5 cm., showing cellular area in dorsal wall. 

 ( X 33.) d.e., anlage of one fold of the dorsal elevation. 



FIG. i6a. Portion of cellular area under greater magnification; showing small 

 bulb of cells, the anlage of a spermathecal tubule. 



FIG. 17. Cloaca of same animal; showing anlagen of dorsal glands. (X33-) 



FIG. 170. Portion of the dorsal gland area under higher magnification. 



FIG. 18. Cloaca of a recently transformed Gyrinophilus female of 10.8 cm.; 

 showing caudal end of developing spermatheca. (X 33-) d.s., top of dorsal slit; 

 the pyramidal area above this point is the anlage of caudal portion of common 

 tube, at this stage not yet a tube, but a shallow depression, d.e., one fold of the 

 dorsal elevation. 



