Plate 2. 



Fig. 1. Lugcnu costatd. XIO". «, front view; //, aiiertui'al vii'w. After 

 Balkwill and Wright. 

 2. Lagena costata. XIOO. Bilocular specimen. After Balkwill and 

 Wright. 

 3,4. Lagena crenata. XIOO. "Typical form." Figure 3, "specimen 



with very few crenations." After Balkwill and Wright. 

 5-7. Lagena cuniUlneata. XIOO. After Balkwill and Wright. 



8. Lagena curvUineata. XIOO. a and b, opposite sides of same speci- 



men. After Balkwill and Wright. 



9. Lagena enrrilineata. X75. After Heron-Allen and Earland. 

 180 



