602 MESIAL FINS OF GANOIDS AND TELEOSTS. 



Plate XXIII. 



Fig. 26. Mesoprion gemhra. First four radial elements of anal fin. 



27. S'phyrcena Gommersonii. Six radial elements of anterior dorsal fin. 



28. „ „ Dorsal view of three elements from the same 



fin, and one spinose ray. 



29. Trigla gurnardus. Dorsal view of four radial elements from anterior 



spinose portion of dorsal fin. 



30. Mugil capito. Four radial elements of anterior dorsal fin. 



31. Anarrhichas lupus. Four elements from dorsal fin and one fin-ray. 



32. „ „ Four radial elements from anal fin. Half nat. size. 



33. Pseudoscarus superhus. The sixth to the eleventh (inclusive) radial 



elements of the dorsal fin. 



34. Balistes capriscus. Radial elements from the central portion of the 



posterior dorsal fin. Enlarged. 



35. Tetrodon immaculatus. Radial elements of dorsal fin. 



36. ,, „ Radial elements of anal fin. 



37. Diodon hystrix. Radial elements of dorsal fin. 



38. „ „ Vertical section of a radial element and its fin-ray, to 

 show the relations of a fin-ray to its distal radial segment, and the 

 mode of articulation between the distal and proximal segments. 



Meference Letters. 



d.s. Distal segment of a radial element. 

 d.sp. Defensive spine. 



d.si. Dorsal radial segment (anal fin of Polgpterus). 

 f. Foramen for the passage of the muscles of fin-rays. 

 fc. Articular facet. 

 f.r. Fin-ray. 

 g.sp. Guard-spine. 

 h. Hook-like process. 

 h.s. Hsemal spine. 

 int.lig. Interossicular ligament. 



n. Notch for passage of muscles of fin-rays, 

 m.s. Mesial segment of a radial element. 

 p.s. Proximal segment of a radial element. 

 pi.p. Postero-inferior process. 

 ps.p). Postero-superior process. 

 r.e. Radial element. 

 r.e}, r.e?, and so on. First, second, and other radial elements. 

 sp.r. Spinose ray. 



v.e. Vestigial radial element. 

 v.st. Ventral radial segment (anal fin oi Folypterus). 



[The reference letters are uniform throughout.] 



