EXPLANATION OF PLATE III. 
Actinoceras hardmani, Eth. Fil. 
Fig. 1. Lateral view showing the septa, and beaded siphuncle at the 
distal or younger end. 
,, 2. Beaded siphuncle — X 2. 
„ 3. Section of the siphuncle showing involutions of the membrane — 
X 3. 
„ 4. Pyriform involutions at the proximal or older end of the shell, 
seen in weathered section — X 5. 
5. Involutions and intermediate ridges at the proximal or older end 
of the shell, seen in partially oblique weathered section — X 5. 
