146 



Contributions to Palaeontology : 



oblique farrows which are faintly impressed in the 

 mould, the anterior one being near the front of the 

 glabella. Occipital furrow slightly impressed at the 

 sides, and not visible in the centre : occipital ring nar- 

 row at the sides, wider and more elevated in the middle 

 (but without appearance of a spine). Dorsal furrow 

 shallow, faintly impressed at the sides, and, in old 

 specimens, not defined in front of the glabella. 

 Fixed cheeks narrow in the middle, gradually expanded 

 towards the front, and curving regularly below into the 

 narrow posterior limb : palpebral lobe not preserved in 

 the specimens described ; ocular ridges [extending ob- 

 liquely across the fixed cheeks ; frontal limb much 

 extended, nearly three-fourths as long as the glabella, 

 plain and gently curving downwards, a little more 

 prominent in the middle, and without transverse ridges 

 or furrows. 



Although but two individuals of this species have beenob tained, 

 the characters are so peculiar as to leave no doubt as to its specific 

 distinction. The glabella is scarcely separated from the frontal limb 

 in the larger individual, and the latter is very long and quite free 

 from ridges or furrows, a character not observed in any other species, 

 A similar extent of frontal limb exists in G. diadematus, G. wiscon- 

 sensis and G. hamulus ; but in these it is marked by furrows or ridges, 

 and connected with a different form of glabella which is limited by 

 a frontal furrow. 



This species is associated with Goncephalites anatinus in a ferru- 

 ginous sandstone at Trempaleau, Wisconsin. 



CONOCEPHALITES ? BINODOSUS (n. s. ). 

 PLATE II. FIG. 47. 



A small pygidium occurring in the sandstone at Osceola 

 mills, differs from any of those before noticed. The axis 

 is short, strong, and abruptly elevated, with three rounded 

 annulations besides the terminal one, which is marked by 

 two distinct nodes : these nodes may have been spines in 



