nnizopODA. 



19 



passages towards the cells of the first zone, which 

 forms a complete ring round the nucleus." 



If the animal of Orbitolltes be decalcified by 



Fig. 4. 



Structure of Orbitolites complanatus: — a, simple disk of 

 Orbitolites, laid open to show its interior ; ;', central cell; v, cir- 

 cumambient shell, surrounded by concentric zones of cells, 

 connected with each other by annular and radiating passages ; — 

 b, portions of sarcode body of the same, showing <r, <r, <r, seg- 

 ments of sarcode contained in the ovate cells ; X, A, their an- 

 nular, and p^ p, p, their radial stolons; — c, peculiar reproduc- 

 tive (?) bodies ; o, gemmule, embedded in sarcode substance ; 

 j8, the same, undergoing fission ; 7, another gemmule, found in 

 one of the superficial cells. 



C 2 



