. Mark anniversary volume; to Edward Laurens Mark, Hersey Professor of Anatomy and Director of the Zoo?logical Laboratory at Harvard University, in celebration of twenty-five years of successful work for the advancement of zoo?logy. Mark, E. L. (Edward Laurens), 1847-1946; Zoology; Anatomy, Comparative; Physiology; Embryology. Fig. H.—Trophi of a number of species of Rattulidse, dorsal view (except 1) (original). Abbreviations: al., alula; Jul, fulcrum; mab., manubrium; rm., ramus; un., uncus. 1, Rattulus longiseta Schrank, side view; 2, the same, dorsal view; 3, Rattulus bicuspes Pell; 4, Rat
. Mark anniversary volume; to Edward Laurens Mark, Hersey Professor of Anatomy and Director of the Zoo?logical Laboratory at Harvard University, in celebration of twenty-five years of successful work for the advancement of zoo?logy. Mark, E. L. (Edward Laurens), 1847-1946; Zoology; Anatomy, Comparative; Physiology; Embryology. Fig. H.—Trophi of a number of species of Rattulidse, dorsal view (except 1) (original). Abbreviations: al., alula; Jul, fulcrum; mab., manubrium; rm., ramus; un., uncus. 1, Rattulus longiseta Schrank, side view; 2, the same, dorsal view; 3, Rattulus bicuspes Pell; 4, Rattulus bicristatus Gosse; 5, Rattulus elongatus Gosse; 6, Diurella sulcata Jennings; 7, Diurella tenuior Gosse; 8, Diurella porcellus Gosse; 9, Rattulus mucosus Stokes; 10, Diurella tigris Muller. without teeth; the left alula is longer than the right. These differences are char- acteristic for the whole family, but are much more pronounced in some species, as a glance at Figure H will show. In such cases as Diurella sulcata Jennings (Fig. H, 6) and D. tenuior Gosse (Fig. H, 7) the right side is much smaller than the left, while in D. tigris Muller (Fig. H, 10) the right manubrium and uncus have almost disappeared. Altogether, then, we find that all the Rattulidse are more or less unsymmetrical in many features of their body structure. If we seek for a general statement which shall express the nature of this asymmetry, we shall find it most fully set forth as fol- lows: Conceiving the middle of the body to be a fixed point, the anterior part of the body seems to be twisted to the right, the posterior part twisted to the 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 Parker, George Howard, 1864-1955. New York, H. Holt and Company
Size: 1319px × 1895px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectphysiology
