PLATE XI. 



Fig. 



1. Eschar a monilifera, p. 68. 



a, a, a, a, a, a, a, a, a. Various forms, natural size. 



a, a. Portions, magnified 6 diameters. 



b, c, d. Tn different conditions, magnified 35 diameters. 



2. E. monilifera. 



a. Portion, showing one of the fertile (?) cells, closed with a cribriform plate. 

 h, b, h. Portions at different ages. 



3. E. monilifera. 



a. Portion of surface nearly smooth. 



b. Transverse section. 



c. Longitudinal section. 



d. Portion in which the front of the cells is worn off. 



e. Back view of incrusting polyzoary {vide also PI. IT, fig. 8). 



4. E. porosa, p. 66. 



a. Natural size. 



b, c, d, e. Various aspects at different ages, magnified 25 diameters. 

 /. Section, magnified 25 diameters. 



