68 Cumings — Development of some Paleozoic Bryozoa. 

 63 64 



65 



p' h' h 



67 



k p 



66 



£ % c' ?' _£ J, a r a 



Figures 63-68. — Early stages of Unitrypa from the Lower Helderberg 

 (Shaly) limestone of Indian Ladder, N. Y. 



^63-65. Top, oblique, and profile views of an individual showing five 

 primary branches (a' to e'), five carinae (a to e), and transverse plates (p, p'). 

 Fig. 64 shows that the carina does not reach the bottom of the cup. In fig. 

 65 the plate p' is seen to be of diamond shape, extending laterally from 

 the carina, while the parallelism between the slope of the plates and the 

 wall of the cup is well shown at p. 66-68. Another individual showing 

 similar features. The hiatus between the carinae and the bottom of the cup 

 is beautifully shown at a and d, fig. 67, and one of the transverse plates at p, 

 fig. 67, andp, fig. 68. 



All figures x 26. 



