"EXPLANATION OF PLATE III. 



Fig. 1. Orygmaidbothrium angustum sp. nov., outline of strobile, enlarged 8 diam- 

 eters. 



Fig. 2. Head and part of neck of same, enlarged 20 diameters. 



Fig. 3. Posterior segment of same, enlarged 20 diameters. 



Fig. 4. Crossobothrium laciniatum gen. et sp. nov., adult strobile, in fresli water, 

 natural size. 



Fig. 5. Head and first segments of same specimen, enlarged 12 diameters. 



Fig. 6. Head and first segments of a specimen after lying for a few minutes in fresli 

 water, enlarged 8 diameters. 



Fig. 7. Posterior segments of same, enlarged G diameters. 



Fig. 8. Posterior segments of another specimen, showing lateral openings for the 

 discharge of ova, enlarged G diameters. 



Fig. 9. Head and first segments of adult, showing one position of bothria while in 

 motion. The bothrium in front view and the one opposite (not shown in 

 sketch) are thrust forward, enlarged 10 diameters. 



Fig. 10. The same, with one bothrium flattened out and applied to the bottom of the 

 watch-glass, enlarged 10 diameters. 



Fig. 11. The same with two bothria pushed forward, the ends extended aud curled 

 outward, enlarged 10 diameters. 



Fig. 12. Free proglottis showing lateral opening for discharge of ova, enlarged G 

 diameters. 



Fig. 13. Free proglottis before the ova are discharged, flattened under the com- 

 pressor, enlarged 10 diameters. 



Fig. 14. Another after most of the ova have been discharged from the lateral open- 

 ing, also flattened under compressor, enlarged 10 diameters. 



Fig. 15. Front view of head of specimen transferred from fresh water to alcohol, en 

 larged 10 diameters. 



Fin. 1G. Transverse section through another specimen, enlarged 10 diameters. 



Fig. 17. Young strobile before segments have made their appearance near the head. 

 The joints at the posterior end are pseudosegments ; flattened under com- 

 pressor, enlarged 12 diameters. 



Fig. 18. Head and anterior part of a young specimen in fresh water, enlarged 12 dia- 

 meters. 



Fig. 18a. Anterior segments of same, enlarged 12 diameters. 



Fig. 18b. Posterior segments of same, enlarged 12 diameters. 



Figures 9, 10, 11, 13, 14, and 17, from living specimens in sea-water ; figures 4, 5, G, 



7, 8, 18, 18a, and 18/>, from living specimens in fresh water; others from alcoholic and 



mounted specimens. 

 All figures made by Mrs. Edwin Linton. 



504 [52] 



