XVIU 



Map Illustrating the GeograpTiical Distribution of the Land-MoUusca 



of the Philippine Islands 455 



HypocoUus nmpelinus, c? 5 *'^ 



Palate of Aulacodus, to illustrate the ridges upon the hard palate . . 525 



Brain of Aulacodus, viewed from above 526 



Blenniophidium petroijauli ; • • 5°^ 



Forficula auricularia, the Common Earwig. Low male and high 



male o»/ 



Diagram showing frequency of occurrence of forceps of various 



lengths in male Earwigs {F. auriadaria) 588 



Diagrams of Xylotrupes gideon, J, seen from side. High male, 



medium male, and low male : 590 



Diagram showing frequency of various lengths of the cephalic horns 



in Xylotmpes gideon, S ^^l 



Table of frequency of elytra of various lengths in Xylotrupes gideon, S 592 

 Table of frequency of various lengths of mandible in Lucanus cervus, 



^ 593 



Brain of Capromys pilorides 598 



Brain of Lagostomus trichodactylus 599 



Brain of Dasyprocta azarcR 602 



Brain of Caelogenys paca 604 



Brain of DoKchotis 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 



Octochestus thomasi, dissected to show the principal organs 673 



