The primitive pores of polyodon spathula

This work was undertaken with the view of determilling the character and significance of these remarkably numerous organs, about which there is very little in the literature.Thf nomenclature of COLLINGE (I) has been used in designating tl-,ese structures as primitive pores.T h e material used was obtained from fishermen, who frequently catch the fish on set lines.Those studied in this case were from