vm 



CONTENTS. 



XXTI. The Anatomy and Metamorphosis of Cyclops . 223 



XXIII. The Hard Parts of a Grasshopper . . . 237 



XXTV. The Internal Anatomy of a Grasshopper . . 258 



XXV. The General Anatomy of Anodonta . . . 269 



XXVI. Examination of Transverse Sections of Unio or 



Anodonta 285 



XXVII. The Lamellibranchiate Gill 296 



XXVIII. The Development of Lamellibranchs . . .311 



XXIX. The General Anatomy op the Squid . . . 332 



XXX. The Development of the Squid .... 364 



