IV PREFACE; 



reproduced where it has been possible to do so. Our obligations 

 to Prof. Rolleston are however far greater than mere passages 

 of description, for it is to his work that our own owes its exist- 

 ence. 



For the sake of brevity we have cited as '.Rolleston,' Forms 

 of Animal Life, by G. ROLLESTON, M.D., Oxford, 1870. 



J. W. CLARK, 



Superintendent. 



T. W. BRIDGE, 



Demonstrator of Comparative- Anatomy. 



MUSEUM OF ZOOLOGY AND COMPARATIVE ANATOMY, 

 CAMBEIDGE, May 20, 1875. 



