EXPLANATION OF PLATE I. 



Fig. 1. Diboihrium manubriforme sp. nov. Adult strobile, natural size. 



Fig. la. Median, segments of same, enlarged 3 diameters. 



Fig. lb. The same, opposite side, showing genital openings, enlarged 3 diameters. 



Fig. 2. Head aud anterior segments of young speeimen , enlarged 12 diameters. 



Fig. 3. Posterior segments of adult, enlarged 10 diameters. 



Fig. 4. Ova. a, ova with white opaque shell; b, ova with thin transparent shell, 



enlarged 150 diameters. 

 Fig. 5. Diboihrium aluierCB sp. nov. Head and anterior segments, marginal view, 



enlarged 4 diameters. 

 Fig. 6. Lateral view of same specimen, enlarged 4 diameters ; length of specimen 



27""". 

 Fig. 7, Lateral view of head of another specimen, enlarged 4 diameters; bothria 



contracted and concave. 

 Fig. 8. Posterior end of same specimen, enlarged 4 diameters; length of specimen 



Fig. 9. EcheneibothHum variabile Van Beneden. Front view of head as seen in living 

 specimens, when the sucking disks are applied to the under surface of 

 the cover-glass, enlarged 36 diameters. 

 Fig. 10. Outline of median, irregular segments, enlarged 10 diameters. 

 FlG. 11. Outline of other segments farther back, showing position of genital aperture, 



enlarged 10 diameters. 

 Fig. 12. One of the same, compressed, showing the genitalia, enlarged 20 diameters. 

 FlG. 13. Lateral view of head, alcoholic specimen, enlarged 20 diameters. 

 Figures 1,2, and 9 from life ; others from alcoholic and mounted specimens. 

 All figures made by Mrs. Edwiu Linton. 



500 [48] 



