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Show xviii Page Map illustrating the Geographical Distribution of the Land-Mollusca of the Philippine Islands 4o5 Hypocolius ampelinus, $ 5 470 Palate of Aulacodus, to illustrate the ridges upon the hard palate . . 525 Brain of Aulacodus, viewed from above 526 Blenniophidium petropauli °°4 Forficula auricularia. the Common Earwig. Low male and high male 587 Diagram showing frequency of occurrence of forceps of various lengths in male Earwigs {F. aurictdaria) 588 Diagrams of Xylotrupes gideon, rf, seen from side. High male, medium male, and low male : 590 Diagram showing frequency of various lengths of the cephalic horns in Xylotrupes gideon, $ 591 Table of frequency of elytra of various lengths in Xylotrupes gideon, <$ 592 Table of frequency of various lengths of mandible in Lucanus cervus, <5 593 Brain of Capromys pilorides , .. . 598 Brain of Lagostomus trichodactylus 599 Brain of Dasyproctu azarce 602 Brain of Ccelogenys paca 604 Brain of Dolichotis patagonica 608 Brain of Aulacodus, viewed from above 611 Brain of Rabbit, showing abnormal development of convolutions . . 612 Segments bearing atrial and sperm-duct pores in a number of Acan-thodrilids 669 Octochcetus thomasi, dissected to show the principal organs 673 |