PLATE VIII. 



Irregularities and Reparations of disks of Orbitolites complanata. 



Fig. 1. — Young disk, with vertical crest growing from central portion. Magnified 

 10 diameters. 



Fig. 2. — Reparation of disk that had been broken across at an early stage. ]\Iagnified 

 8 diameters. 



Fig. 3. — Irregular growth of young disk, with vertical crest. Magnified 10 dia- 

 meters. 



Figs. 4-9. — Reparations of disks fractured in various ways, all tending to reproduce 

 the discoidal form. Magnified from 4 to 6 diameters. 



Fig. 10. — Production of complete disk around marginal fragment of older disk. Tin- 

 outer annuli of this disk are deficient in radial partitions. Magnified 6 diameters. 



Fig. 11. — Double monster, probably formed by fusion of two originally separate indi- 

 viduals. Magnified 10 diameters. 



