236 DR. CARPENTER'S RESEARCHES ON THE FORAMINIFERA. 



passages, directed alternately to one side and to the other, which lead to 



the cavities of the columnar cells : 35 diam. 

 Fig. 3. Horizontal section of the intermediate layer, immediately beneath the floors 



of the superficial cells, laying open the annular canals, with the summits of 



the columnar cells: 100 diam. 

 Figs. 4 9. Various examples of the Reparation of disks after fracture, and of the 



growth of new disks from detached fragments. For description, see 



^[37 40 of Memoir. Fig. 6 is magnified 6 diam. ; the rest 35 diam. 

 Fig. 10. Monstrosity formed by the inclusion of a young disk within the outer zones 



of an older one, that seems to have been brought into contact with it by 



the progressive increase of its own diameter: 25 diam. 



PLATE IX. 



Figs. 1 4. Various departures from the typical mode of concentric development, 



presented in their early state, both by simple and complex disks ; some of 



them even passing towards a spiral mode of evolution. Figs. 1 and 3 are 



magnified 35 diam. ; Figs. 2 and 4 are enlarged 90 diam. 



The remaining figures show various forms of Monstrosity, produced by excess of 



growth from the nucleus. 



Fig. 5, 6. Two views of a disk from the Philippine shores, having a single plane on 

 one side, and two planes, meeting at an acute angle, on the other : 6 diarn. 



Figs. 7, 8, 9. Small Australian disks, with vertical crests: 35 diam. 



Fig. 10. Disk from the ^Egean Sea, with a tri-radiate crest: 35 diam. 



