. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PALM AND SOLE STUDIES. FIG. 50. 145. as a whole. There is also shown a marked tendency for all the ridges to shift from the longitudinal position of the apes to one more nearly transverse, and this ten- dency is much more marked in right than in left hands, evidently corresponding to use, and recording the change from the grasping of tree boughs to the holding of tools and other objects. While all degrees of the loss of the original configuration and the assumption of transverse ridges may be found in different human hands,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PALM AND SOLE STUDIES. FIG. 50. 145. as a whole. There is also shown a marked tendency for all the ridges to shift from the longitudinal position of the apes to one more nearly transverse, and this ten- dency is much more marked in right than in left hands, evidently corresponding to use, and recording the change from the grasping of tree boughs to the holding of tools and other objects. While all degrees of the loss of the original configuration and the assumption of transverse ridges may be found in different human hands, it is seldom that so many of the mound patterns are retained as in Fig. 5 (Coll. No. 90). The formula, however, 11-9-7-5, indicated the establishment of the transverse position in the interdigital region. Fig. 5a shows a very primitive Thenar region in a Liberian negro. (Coll. No. 571, taken by F. Starr.) evident that in the human species a very considerable reduction of these points has taken place. There are left in all cases, however, the four main triradii, which are so constant as to allow their use as the starting points in palm formulation although it is by no means certain that they are in all cases strictly homol- ogous. Thus, from Figs. 3 and 4 it is seen that the second inter- digital pattern has originally two distal triradii, either of which might persist as triradius A, and it is likely that the one that appears is sometimes one and sometimes the other of the original two. Other of the missing triradii appear occasionally somewhat lower down on the palm (proximal to the pattern) especially in connection with the fourth pattern. A definite hypothenar pattern appears on about 20 per cent, of hands of the white race, but the occurrence differs considerably racially and in some may be either more or less frequent. It is occasionally found in its more primitive form, as a whorl with. Please note that these images are extracted from scanned page images that may have bee
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
