A 



MANUAL OF ZOOLOGY 



FOR THE USE OF STUDENTS. 



m % f riiuigto 0f 



BY 



HENBY ALLEYNE NICHOLSON, 



M.D., D.Sc., M.A., PH.D. (GoTT.), F.E.S.E., P.G.S. 



LECTURER ON NATURAL HISTORY IN THE EXTRA-ACADEMICAL SCHOOL OF EDINBURGH, 

 VICE-PRESIDENT OF THE GEOLOGICAL SOCIETY OP EDINBURGH, ETC. 



VOL. I. INVERTEBRATE ANIMALS. 



LONDON: 



EOBEET HAEDWICKE, 192 PICCADILLY. 



1870. 



