568 MO A' TO OMER Y. 



EXPLANATION OF PLATE XXIII. 



Fig. 102. Blood corpuscle of Doto (picro-nitro-osmic acid, 33 min. ; Del. 

 haematoxylin, 30 min.; eosin, 5 min.). 



Figs. 103-133 : Egg development of Tetrastemma catenulatum. 



Figs. 103-106. Germinal vesicles (aq. sol. sublimate ; Ranvier's picrocarmine ; 

 Del. haematoxylin). 



Fig. 107. Portion of a young gonad (as in 103). 



Fig. 108. Immature ovum (as in 103). 



Fig. 109. Germinal vesicle (aq. sol. sublimate; Del. haematoxylin, 25 min.; 

 eosin, 5 min.). 



Figs, no and iii. Germinal vesicles (aq. sol. sublimate ; Del. haematoxylin, 

 15 min.; eosin, 5 min.). 



Fig. 112. Germinal vesicle with portion of the surrounding cytoplasm (as in 

 no). 



Fig. 113. Germinal vesicle (as in no). 



Fig. 114. Idem, with portion of the surrounding cytoplasm (as in no). 



Figs. 115 and 116. Outlines of young ova (as in no). 



Figs. 117-119. Germinal vesicles (as in no). 



Fig. 120. Outline of germinal vesicle, the natural color of the nucleoli shown 

 (aq. sol. sublimate). 



Fig. 121. Tangential section of the inner surface of the nuclear membrane, 

 the dotted line representing the greatest diameter of the nucleus (as in 109). 



Figs. 122-133. Germinal vesicles (as in 109). 



Figs. 134-136: Outlines of the nuclei of ganglion cells of Piscicola. 



Figs. 134 and 135 (alcohol, sol. sublimate). 

 Fig. 136 (Flemming's fluid, i hr.). 



