EXPLANATION OF PLATE IV. 



Fig. 1. Calliobothriumverticillatum Rudolpki. Head and first segments turned so that 

 both a marginal and a lateral view may bo obtained, enlarged 20 diameters. 



Fig. 2. Transition segments near head, showing the formation of secondary lateral 

 flaps, enlarged 20 diameters. 



Fig. 3. Segments farther back, showing transition from three lacinise to four, en- 

 larged 20 diameters. 



Fig. 4. Segments still farther back. The two median laciniae have become of equal 

 length and nearly as long as the primary flaps ; enlarged 20 diameters. 



Fig. f>. Segments still farther towards posterior end, showing incipient obliteration 

 of the two median lateral laciniae, enlarged 20 diameters. 



Fig. 6. Segments approaching posterior end, showing further modification of poste- 

 rior margin, enlarged 20 diameters. 



Fig. 7. Segments near posterior end of strobile, enlarged 20 diameters. 



Fig. 8. Posterior mature segment, enlarged 20 diameters. 



Fig. 9. Bhynchobothrium bisulcatum sp. nov. Head and neck, lateral view, var. a (see 

 description), enlarged 15 diameters. 



Fig. 10. Anterior segments of same specimen, enlarged 9 diameters. 



Fig. 11. Antero-median segments of same, enlarged 9 diameters. 



Fig. 12. Posterior segments of same ; length of strobile 48" 1,n ; enlarged 9 diameters. 



Fig. 13. Head and neck, marginal view, var. y (see description) ; length of* strobile 

 92 mm ; enlarged 15 diameters. 



Fig. 14. Antero-median segments of same, enlarged 9 diameters. 



Fig. 15. Median segments of same, enlarged 9 diameters. 



Fig. 16. Posterior segments of same, enlarged 9 diameters. 



Fi<;. 17 Anterior segments of 'another specimen, var. j3 (see description) ; length of 

 strobile 230 m,n ; enlarged 9 diameters. 



Fig. 18. Median segments of same, enlarged 9 diameters. 



Fig. 19. Postero-median segments of same, enlarged 9 diameters. 



Fig. 20. Outline of posterior segments of same, enlarged 9 diameters. 



Fig. 21. Abnormal form, secondary chain of segments, originating from the margins 

 of two primary segments, enlarged 10 diameters. 



Fig. 22. Another secondary chain from the postero-marginal border of a primary seg- 

 ment, enlarged 10 diameters. 



Fig. 23. Apex of proboscis, enlarged 150 diameters. 



Fig. 23(/. Base of same, enlarged 150 diameters. 



Fig. 24. Phoreiobothrium lasium gen. et sp. nov. Outline of strobile, enlarged G diam- 

 eters. 



Fig. 25. Front view of head, enlarged 20 diameters. 



Fig. 2G. Lateral view of head of another specimen, enlarged 40 diameters. 



Fig. 26a. Spines from neck of same, enlarged 350 diameters. 



Fig. 27. Compound hooks from one bothrium, enlarged 175 diameters. 



FlG. 28. Another specimen with many spines on the neck, and showing striai on both- 

 ria somewhat flattened under compressor ; enlarged 20 diameters. 



Fig. 29. Posterior mature segment, enlarged 20 diameters. 

 All the figures in this plate made from alcoholic or mounted specimens, by Mrs. 



Edwin Linton. 



506 [54] 



