94 H. J. VAN CLEAVE. 



PLATE I. 



All drawings were made from whole mounts with the aid of a camera 

 lucida and at a uniform magnification. 



The vitellarium is viewed from the ventral surface in all instances except 

 in Figs. 4 and 7, which are drawn from the dorsal surface. 



FIG. i. Vitellarium of normal mature female, showing usual form of the 

 gland and characteristic number and arrangement of the nuclei. 



FIG. 2. Very small vitellarium from a presumably young female. 



FIG. 3. Vitellarium showing characteristically vacuolated nuclei, one of 

 which has the chromatic substance so much dispersed that it is distinctly paler 

 in color. 



FIG. 4. Vitellarium showing lobed, angular and constricted nuclei. 



FIG. 5. Vitellarium with peculiarly twisted and cleft nuclei. 



FIG. 6. Abnormal vitellarium with greatly elongated and constricted nuclei. 



FIG. 7. Abnormal vitellarium with 10 nuclei. In this drawing the ovary 

 is shown overlying the vitellarium on the right side. 



FIG. 8. Abnormal vitellarium with 10 nuclei. Part of the ovary is shown 

 underlying the vitellarium on the left of this drawing. 



FIG. 9. Abnormal vitellarium with 12 nuclei. 



