. Breviora. BREVIOBA No. 250 of the sections that represent various levels (Figs. 2 to 11). The nucleus iutercalatus is found in most birds. In the emu it is a rather inconspicuous part of the wulst lying between the fibers of the lamina frontalis (Fig. 4). It is composed of small nerve cells and is more compact than the rest of the nucleus diffusus of which it is a part (if the nucleus diffusus is defined, as in this paper, as that part of the gray mass lying within or above the lamina frontalis). The division between wulst (nucleus ditfusus) (HA, IID) and nucleus epibasalis dorsalis (HV) is
. Breviora. BREVIOBA No. 250 of the sections that represent various levels (Figs. 2 to 11). The nucleus iutercalatus is found in most birds. In the emu it is a rather inconspicuous part of the wulst lying between the fibers of the lamina frontalis (Fig. 4). It is composed of small nerve cells and is more compact than the rest of the nucleus diffusus of which it is a part (if the nucleus diffusus is defined, as in this paper, as that part of the gray mass lying within or above the lamina frontalis). The division between wulst (nucleus ditfusus) (HA, IID) and nucleus epibasalis dorsalis (HV) is quite clear in the emu, the lamina frontalis being well developed, but in my specimen it is not split into two parts, superior and suprema. Therefore, one cannot make out a distinct nucleus lying between the parts. Fig. IB. A simplified diagram of the principal forebrain ganglia showing perspective, to give some idea of the anteroposterior relationships. The serial sections from which the diagrams were draw'n are (from front to back) #161, #361, #501, #701, #901, #1201, #1281. Their position on the whole brain is shown by vertical lines on the small Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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