viii LIST Or PLATES. 



TO FACF 



PLATE I'AliK 



XLIII. THE HALTER AND TVMPANIC ORGAN - 610 



XLIV. THE AUDITORY MECHANISM - 624 



XLV. THE DORSAL VESSEL - 640 



XLVI. 'Jill. 1'F.KICAKDIAL SEPTUM 646 



XLYII. THE FEMALE GENERATIVE ORGANS 666 



XLVIII. SPERMATOGENESIS 694 



XLIX. DEVELOPMENT OF THE OVARY 698 



L. THE INVAGINATED SEGMENTS OF Till MALE 736 



LI. THE MALE ORGAN- 738 



LI I. 740 



