594 DR. CAEPENTEE'S EESEAECHES ON THE FOEAMINIFEEA. 



portion of the reticulation, so as to display the dark spiculiferous substance 



within. Magnified 30 diameters. 

 Fig. 10. Portion of the group of Carpenterice growing on the surface of Porites, of the 



natural size. 



Fig. 11. An unusually large specimen, of the actual size. 

 Fig. 12. Portion of a section taken in the same direction as fig. 7, but represented on a 



larger scale, showing the annulations of the foramina that are seen obliquely 



traversing the shell, and the two layers, of which not only the principal septa 



a, a, but also the incomplete septum b, are formed, with the canals included 



between them. Magnified 75 diameters. 

 Figs. 13, 14. External apertures at the apex of the cone of two specimens, showing 



their peculiarly Milioline character. Magnified 20 diameters. 

 Fig. 15. Section traversing the external wall of one of the chambers perpendicularly to 



its surface, showing at a, a, the annulated foramina by which it is traversed, 



and at b, b, b, sections of the imperfect septa, on which the foramina do not 



open. Magnified 75 diameters. 

 Fig. 16. Siliceous spicules (resembling those of Halichondria) from the spongeous tissue 



occupying the chambers of Carpenteria. Magnified 75 diameters. 



