Plate 6. 



Fig. 1. Ltifioui Jvcldu. a. front view; h. apertiiral view. After Williamson. 

 2. Lafiena Ivcida, var. After Williamson. 



8. Lagena lyeUi. X75. After Heron-Allen and Earland. 



4. Lagena DWicomsonii. X120. After Heron-Allen and Earland. 



5. Lagena lineata. XIOO. After Balkwill and Wright. 



6. Lagena lineata. XIOO. AVitli basal spine. After Balkwill and 



Wright. 

 7, 8. Lagena lineata. XIOO. "Abnormal." After Balkwill and Wright. 



9. Lagena marginata. X113. After Heron-Allen and Earland. 

 10-] 2. Lagena orhiginjana, var. elUptica. X50. Front views. D21.*>0. 



]3. Lagena marginata, var. scmicarinata. X200. After Heron-Allen and 

 Earland. 

 14. 1.1. Lagena marginata, var. seniiinarginata. Fig. 14. XGO; tig. LI, X75. 

 After H. B. Brady. 

 184 



