explanation of plates 369 



Explanation op Plates 



Pl^\TE 10. AIORPHOLOGY OF THE TrEPOSTOMATA. 



Figures 1-7 and 9. — Longitudinal sections of Beterotrypa suhra^mosa Ulrich. 



The cysts aiul their iiu-loserl hrowii masses (ft) are shown lii 

 those fisuivs. The proxiiii.-il :uul distal diaphraguis are lettered 

 </' and (I respcclively. and the neck of the cysts )(7.". The distal 

 diaphragm is ott(>n greatly thickened, while the zooecium of which 

 it forms the hasal wall has an unusually thick cingulum (fignre>^ 

 1 and r»). All figures X 05. (128^16, 11, 5, 5, 4, 4, 4, 14.) 



Figures S and 10. — Longitudinal sections of three zooeeia of Batostoma 

 variabile. 



Significance of letters the same as in preceding figures. In the 

 right-hand zocecium of figure 8 the neck of the cyst is very nar- 

 row and straight, and its connection with the lower part of the 

 cyst has heen ohliterated Figure 10 shows two successive sets of 

 cystiphragms and brown bodies (b and 6'). X 65. (126-6 ; 94-10.) 



