PLATE XLVIII. 



PAGE. 

 CAMEHOCERAS PHOTEIFORME Hall 777 



(See also plates xi.ix, i,, 1.1. 1.11 - 



An internal cast of a very lonj? siphon, viewed from the siphonal side of the 

 shell; showing the oblique marks of the septa! funnels and the outline of the 

 continuous apical sheath. From the Trenton limestone. Wykoff, Minn. 



