370 E. R. CUMINGS — POSITION OF THE MONTICULIPOROIDS 



Plate 22. — Development of the Monticuliporoids 



FiGUEE 32. — Pliotograpli of the same lectio?! as Figure 31. 



The arrangement of the zooecia in the maculae is the same as in the 

 initial region, x l^- 

 Figure 33. — Vertical Section through the initial Region of Prasopora conoidea, 

 from Cannon Falls. 



Note the position of the tip of the lateral, posteriorly directed bud — in 

 this section directed to the left, x 18. (106-3.) 

 Figure 34. — Vertical Section through the initial Region of Prasopora conoidea. 

 In a plane at right angles to that of figure 33 and figures 21, 22, etcetera. 

 X 18. (106-9.) 

 Figure 35. — Same Section as Figure 21. x ^^• 

 Figure 36. — Same Section as Figure 25. X ^^• 

 Figure 37. — Same Section as Figure 1. X ^^^ 

 Figure 38. — Same Section as Figure 16. X ^^^ 

 Figure 39. — Same Section as Figure 7. X ^^• 



Figure 40. — Tra/nsverse Section of the initial Region of Rhomhotrypa quad- 

 rata (Rom.), cutting a little al)0ve the Protoecium. 



Note the acanthopores. X 18. Cut No. XYI, Tanner's cr. Liberty for- 

 mation. (106-22.) 

 Figure 41. — Base of a Colony of the recent Bryozoan Discoporella. 



Note the great similarity of the budding plan to that of the Treposto- 

 mata. x 18- 



