414 Edward Phelps Allis jr.. 



figures of his oldest larvae, do not, it may be noted, bear teeth at 

 all comparable to those shown by Parker, being simply roughened, 

 along parts of their oral surface, by the small and closely crowded 

 eminences frequently found on the lining bones of the mouth cavity. 

 Furthermore Parker's flg. 3, pi. 37, shows the superficial palatines 

 without teeth, as I find them, the teeth shown in his other figures 

 of this bone here being borne by the bones of the maxillary chain. 

 These latter figures are thus probably in error, though it is difficult 

 to see how this error could have arisen. 



The dorsal postorbital bone is evidently, as in Amia, a dermal 

 postfrontal. 



Having left this postfrontal bone the main infraorbital canal 

 enters the squamosal, and there immediately anastomoses with the 

 hind end of the supraorbital canal, the anastomosis taking place in 

 the body of the squamosal, and not at or anterior to the anterior 

 edge of that bone, as it does in Amia. Lepidosteus, in this, and also 

 in certain other features, apparently presents, as will be later shown, 

 a condition somewhat intermediate between teleosts and the chondro- 

 stean ganoids. After this anastomosis, the main infraorbital canal 

 turns backward in the squamosal and traverses that bone and then 

 a lateral extrascapular, beyond which point my skeleton did not per- 

 mit of its being traced. Near the hind end of the squamosal it ana- 

 stomoses with the dorsal end of the preopercular canal ; and as it traverses 

 tlie lateral extrascapular it gives off the supratemporal canal, which 

 runs mesially first through the lateral extrascapular and then through 

 a second or mesial extrascapular, to join, in the middle line, at the 

 mesial edge of the latter bone, its fellow of the opposite side. This 

 mesial extrascapular is not shown, as a separate bone, by Parker, in 

 the 4' 2 inch larva figured by him, and it is there certainly fused, if 

 the figure is correct, with the hind end of the true parietal to form 

 the parietal of his descriptions. It is shown as a separate bone, in 

 the adult, by both Collinge and Agassiz [i], being called by the 

 former the dermo-occipital, and by the latter, the "occipital supérieur*'. 



The supraorbital canal begins at the hind edge of that corner 

 of the nasal bone that projects backward between the nasal aper- 



