PLATE Him 
Orthoceras luxtjm. 
Page 244. 
See Plates 35, 76, 78, 78 B, 81, 112. 
Fig. 1. An individual of this species, preserving a large portion of the chamber of habitation, and twenty- 
three of the ordinary chambers. Schoharie, N. Y. 
Fig. 2. A small individual showing the concave walls of the chambers in the lower part of the figure. The 
organic deposit is not represented. Schoharie, N. Y. 
Fig. 3. Ventral view of a specimen with the apical portion much compressed. The organic deposit indi. 
eating the ventral side is not shown in the figure. Clarksville, N. Y. 
Fig. 4. Fragment showing the siphuncle exposed by weathering, and the longitudinal plications extending 
along the separate beads. Schoharie, N. Y. 
Fig. 5. A septate fragment showing the walls of the chambers broken away, except a few of the upper ones, 
. and the organic deposit nearly filling the interseptal spaces. This feature is more satisfactorily 
shown in another specimen, represented in figure 13, plate 81. Schoharie, N. Y. 
Fig. 6. Ventral side of the apical portion of an individual, retaining much of its normal form. The longi¬ 
tudinal carina on the ventrum is not represented. 
Fig. 7. Lateral view of a specimen, showing the dislocation and obliquity of the chambers caused by com¬ 
pression. 
Fig. 8. Longitudinal section, showing the convexity of the septa and the depth of the chambers. The ele¬ 
ments of the siphuncle are more fully represented in figure 3, plate 78 B. 
