24 Commercial Shark Fishing in the Caribbean Area 



Cusps of both upper and lower teeth 

 smooth edged, serrations (if any) being 

 confined to their basal expansion. 



Great Hammerhead, Sphyrna tudes, 

 Figure 51. 



Free rear tip of second dorsal only about 

 as long as its vertical height and consid- 

 erably shorter than its front margin. 

 Pelvics with strongly convex front mar- 

 gins. 



Margins -of teeth serrate on cusps as well 

 as on basal expansions. 



II. Sharks with no anal fin — Figures 52 through 56. 



A. Ordinary shaped head — Figures 52 through 55. 



1. Strong conspicuous spine along front margin 

 of each dorsal fin; snout projects considerably 

 beyond mouth; eyes on sides of head; front 

 margins of pectorals do not overlap gill open- 

 ings. 



Common Spiny Dog Fish, Squalus acanthias, 

 Figure 52. 



Spine of first dorsal fin is over the inner corner 



of the pectoral or to the rear of it. 



Inner corner of pectoral is rounded, its far 



margin only weakly concave. 



Upper and lower teeth alike, each with one 



cusp only (See Figure 52). 



Lower rear margin of caudal fin not notched 



near the tip 



Cuban Spiny Dog Fish, Squalus cubensis, 

 Figure 53. 



Spine of first dorsal fin is about over the, mid- 

 point of the inner margin of the pectoral. 

 Inner corner of pectoral fin pointed, its far 

 margin deeply concave. 



TeetJi and lower rear margin of caudal fin are 

 like those in Common Spiny Dog Fish. 



