/i^/^yf 



C/7 



., 3 ^^ ^ 



tSecliono^ 



THE 



AMBRIDGE NATURAL HISTORY 



EDITED BY 



HARMER, M.A., Fellow of King's College, Cambridge ; Super- 

 atendent of the University Museum of Zoology 



AND 



. SHIPLEY, M-A., Fellow of Christ's College, Cambridge; 

 Jniversity Lecturer on the Morphology of Invertebrates 



VOLUME III 



