A 



MANUAL OF ZOOLOGY 



FOR THE USE OF STUDENTS. 



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BY 



HENRY ALLEYNE NICHOLSON, 



M.D., D.Sc., M.A., PH.D. (GOTT.), F.R.S.E., F.G.S. 



LECTURER ON NATURAL HISTORY IN THE MEDICAL SCHOOL OF EDINBURGH : 

 VICE-PRESIDENT OF THE GEOLOGICAL SOCIETY OF EDINBURGH, KTC. 



AUTHOR OF 'ADVANCED TEXT -BOOK OF ZOOLOGY FOR THE USE OF SCHOOLS: 

 'ESSAY ON THE GEOLOGY OF CUMBERLAND AND WESTMORELAND;' 



4 GRAPTOLITES OF THE SKIDDAW SERIES,' ETC. ETC. 



VOL. II. VERTEBRATE ANIMALS. 



WILLIAM ELACKWOOD AND SONS, 



I'DINBURGH AND LONDON. 



MDCCCLXX. 



