In a previous communication1 one of us (B. W.) has described the normal anatomic variations in the cranial venous sinus patterns, particularly in the region of the torcular Herophili. As a part of that study, it was noted that the markings on the occipital bone closely corresponded to the differences in the volume of the lateral sinuses and followed exactly the distribution of these sinuses. To recapitulate, 47 of 100 roentgenograms of the skull showed equal markings, 32 demonstrated a noticeable difference in size, 15 showed indefinite markings on each side, 2 showed no bony evidence of the sinus pattern on either side and 4 showed no markings on one side and very definite markings on the opposite side. For practical purposes, discussed later, it is important to have a similar clinical record of these observations, and it is the purpose of this paper to correlate roentgenograms of this