Plate 10. 



Figs. 1,2. Iaidchu spuitiosa. X150. After Heron-Allen and Earland. Figure 

 2, "external shell broken away, showing internal structure." 



3. La(jcna squamosa. After Williamson. 



4. Lagena squamosa. XIOO. "Bilocular." After Balkwill and 



Wright. 

 5,6. Lac/cna stvlUucm. X75. 5(/, front view; 5h, apertural view; Qa, 

 front view ; 6b, apertural view. After H. B. Brady. 



7. Lagciia steicartii. X120. a, front view; h, apertural view. After 



Heron-Allen and Earland. 



8. Lagena sublagenoides. X40. D2377. 



9. Lagena striata. After Williamson. 



10. Lagena striato-punctata. XIOO. After Balkwill and Wright. 



11. Lagena substriata. After Williamson. 

 188 



