. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 300 E. G. F. Sauer Bonn, zool. Beitr. the longest radii yields a thickness of mm, that of the shortest radii comes to mm. Similarly, comparisons of the groups of relatively uniform outside and inside curvatures yield values of mm (Fig. 8, vertical readings) and mm (horizontal readings). These figures are higher than the average thick- ness of mm derived from the measurements of the worn fragment. This one would expect. While the wear of the
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 300 E. G. F. Sauer Bonn, zool. Beitr. the longest radii yields a thickness of mm, that of the shortest radii comes to mm. Similarly, comparisons of the groups of relatively uniform outside and inside curvatures yield values of mm (Fig. 8, vertical readings) and mm (horizontal readings). These figures are higher than the average thick- ness of mm derived from the measurements of the worn fragment. This one would expect. While the wear of the shell probably affected its curvatures too, the average theoretical value of mm, which is the mean of the four calculated thicknesses, may yet be considered the best approximation to the thickness of the shell in its original state. For an estimate of the size of the egg we refer to the measurements of curvature. In a piece from the equator of the egg the radii of curvatures are maximally different and occur at right angles. As only one piece of shell is available, which does not show the equatorial radius unequivocally, its longest and shortest radii on the two surfaces can be used only as crude approximations to the lengthwise and crosswise radii at the egg's equator. How much they differ from the real dimensions may be judged from the result, particularly from a comparison of radial indices. As the mammillary surface is less worn than the outer surface, the maximally different radii of and mm from the measurements of the inner surface are chosen for a first approach. The long radius is made equal to the lengthwise radius of the egg, a2/b, and the short radius becomes the semiaxis b, both + + + ++ Fig. 8. P. libycus. Geneva lens measure readings of curvatures in millimeters on the outer [+) and inner (—) surfaces of the shell Please note that these images are extracted from scanned pag
Size: 1719px × 1453px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
