Plate 4. 



Fig. 1. La<jcna (flohosa. o, front view ; h, apertural view. After Wil- 

 liamson. 

 2. Lageiia (/lohosd. Viewed by transmitted ligbt. After Williamson. 

 3, 4. Litffciia gracilis. After Williamson. 



5. Lagena gmciUima. X40. D2555. 



6. Lagena hexagona. After Williamson. 



7. Lagena hispida. X50. D2150. 



8. Lagena hispida. X170. After Heron-Allen and Earland. 



9-11. Lagena iota. X50. Figures 9 and 10, front views. Figure 11, side 

 view. D2041. 

 12, 13. Lagena Uicunata. X113. After Heron-Allen and Earland. 



182 



