ft 



PREFACE 



OF the diagrams which illustrate this little 

 "*" volume, the majority were prepared by Miss E. 



^ C. Abbott (formerly Bathurst Scholar at Newn- 

 ham College, Cambridge) : the sketches were 

 made from specimens in the South Kensington 

 Museum of Natural History, which has kindly 



* granted permission for their use. In addition to 

 these, there are several figures that are taken 

 from specimens in my possession, photographed 

 by the publishers ; two or three cuts are diagram- 

 matic; and I owe to the kindness of Mr. J. 

 Craggs, formerly president of the Northumber- 

 land Microscopical Association, the drawings of 

 Polycystina and of the scales of the Sole. 



' B. L. 



