594 
DE. CAEPEXTEE’S EESEAECHES OX THE EOEA^nXITEEA. 
portion of the reticulation, so as to display the dark spiculiferous substance 
within. Magnified 30 diameters. 
Fig. 10. Portion of the group of Carjpenterice 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 piincipal septa 
«, a, but also the incomplete septum h, 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 <z, a, the annulated foramina by which it is traversed, 
and at b, h, h, sections of the imperfect septa, on which the foramina do not 
open. Magnified 75 diameters. 
Fig. 16. Sihceous spicules (resembling those oi Halicliondna) from the spongeous tissue 
occupying the chambers of Carj^erderia. Magnified 75 diameters. 
