PLATE XXXVII. 



PAGE. 



Fig. 1. HETEBOTBYPA PBOLIFICA Ulr 413 



1. A nearly complete example of the frondeseent form of this species. 

 Natural size. 



1 a. Surface of same x!2. 



2 6. Tangential section x!8. 



1 c. Portion of 1 6 x50, to show the minute structure of walls and acantho- 

 pores. 



1 d. Outer portion of a vertical sextion, x!8. Near the I>-ft margin are ehown 



some of the peculiar concave diaphragms. 

 Cincinnati group, Blanchester, Ohio. 

 E. O. Ulrieh's collection. 



Fig. 2. HETEKOTKYPA INFLECTA Ulr 414 



2 and 2 a. Two fragments of this species. Natuial size. 

 2 b. Surface x!2. Shows its perfect condition. 



2 e. Vertical section x!8, showing structure just beneath the surface of a 



perfect example. 

 Cincinnati, Ohio. 

 E. 0. Ulrieh's collection. 



Fig. 3. HBTEKOTBYPA SINOULAEIS Ulr 415 



3. A fragment of medium size. 3 a, one much smaller. Both natural size. 



3 6. Surface of (he larger specimen x!2. Slightly worn. 

 3 c. Tangential section x!8. 



3d. Portion of 3c. x50. 



8 e. Peripheral portion of a vertical section, x!8, showing the irregular 



tabulation of the zooeoial tubes. 



Cincinnati group. Wilmington, 111. 



IllinoisIState Museum. 



