DESCRIPTION OF PLATES. 



All figures are drawn with a Zeiss camera lucida, unless otherwise 

 stated. 



PLATE 33. 



Figs. 1-4. Changes in form of living Gyrocotyle, as seen by Lonnberg 

 (1891, Taf. Ill, figs. 34, 35, 36, 37). Fig. 1, the Ligula-like form; fig. 2, 

 rosette extended into long tube; figs. 3 and 4, form ordinarily assumed 

 by animal. 



Figs. 5 and 6, Diesing's figures of Gyrocotyle rugosa. (Diesing 1855, 

 Taf. 1, figs. 17, 20.) 



Figs. 7, 8, 9. Sketches of the acetabulum of a living specimen. Figs. 

 7, 9, extended; fig. 8, contracted. 



acet. acetabulum. p. op. penis opening. 



[438] 



