52 THE ZOOLOGIST. 



Abnormalities. — The abnormalities observed among the 

 number of Tapeworms collected were few. The chief diversions 

 from the normal type were: — (1) Interpolated segments; 

 (2) Perforated segments ; (3) Irregularity of the genital organs. 



(1) Interpolated Segments. — Here the extra segments were 

 triangular in shape and wedged in between two normal segments. 

 No genital organs occurred in these interpolated segments. 



(2) Perforated Segments. — Three cases of this abnormality 

 were observed. The perforation was clean and not jagged, and 

 showed for about three segments. 



(3) Irregularity of Genital Organs. — In a Cestode from the 

 Plover some of the segments showed the genital openings to be 

 irregularly disposed, instead of unilateral. 



In conclusion, it may be stated that several of the parasites, 

 about fifty, were permanently stained, mounted, and duly 

 labelled. 



BlBLIOGBAPHY. 



(1) ' Encyclopaedia Britannica.' 



(2) ' Catalogue of Entozoa, 1853, of the British Museum.' 



(3) 'The Journal, Board of Agriculture.' "The Food of 

 British Birds," by Newstead. 



(4) 'Wild Birds Useful and Injurious,' by Archibald. 



(5) ' Taeniod Cestodes of North American Birds,' by Bansom. 

 1909. 



(6) ' Parasites. Entozoa,' by Cobbold. 



(7) ' Agricultural Zoology,' by Theobald. 



(8) Cambridge Natural History, ' Protozoa.' 



(9) „ „ „ 'Worms.' 



(10) 'Lancet,' 1883-7, 1877, 1868. 



