Plate XLIII Continued. 



PAGE. 



Fig. 7. CYSTODICTYA GILBEBTI Meek 320 



Two marginal rows of cells in perfect condition, x!8. 

 Upper Helderberg, Falls of the Ohio. 

 E. O. Ulrich's collection. 



Fig. 8. COSCINIUM CBIBBIFOKME Prout 497 



Marginal row of cells x 18, showing like the preceding the perfect con- 

 dition of the superficial aperture among the OystodictyoniilcK. 

 Ohio Falls. 



Fig. 9. BOTBYLLOPOEA sociALis ( ?) Nicholson 490 



U. Portion of a large colony, natural size. 



9 a. Tangential section of same, x!8, showing four zooecia rays separated by 



interstitial vesicles, and at the upper left hand corner several of the 



large vesicles filling the spaces between the stars of a colony. 

 9 b. Vertical section of same x!8, showing part of two layers. The small 



tabulated tubes represent the zooeeia. 



Hamilton group, Erie Co., N. Y. 



E. O. Ulrich's collection. 



i ril 



rfoii- 



lulfl 



>itt lc. , -nit-Hi -.!, mini ! 







