PLATE XLVIII. 
Fig. 1 CAMEROCERAS PROTEIFORME Hall............. AGcuDo.copnog oan Soo ncGoneonaseMEoOnGc 717 
(See also plates XLIX, L, Li, LII.) 
An internal cast of a very long siphon, viewed from the siphonal side of the 
shell; showing the oblique marks of the septal funnels and the outline of the 
continuous apical sheath. From the Trenton limestone, Wykoff, Minn. 
