ye 
THE ARGONAUT.—THE NAUTILUS. 
Tuer day following, Dr. McLean brought 
Undine a large translucent shell; so thin and 
shining was it as to suggest the possibility of 
its vanishing in air like a bubble. 
“Yesterday,” he said, placing the shell in 
her hand, “ your cousin told us how a people 
learned to make lace from a piece of seaweed. 
I will tell you how the Argonauta taught men 
navigation. 
“The argonaut and nautilus, although both 
belonging to the cephalopods—the highest di- 
vision of the mollusks—are in most points quite 
unlike; yet in consequence of a similarity in 
the form of their shells their names have often 
been indiscriminately used. The little voyager 
with the silken sail is the Argonauta Argo, : 
quite generally known as paper nautilus. 
“Many and charming are the stories told of 
this little sailor who, in his fairy bark with 
satin sail, was ea the ‘unshadowed 
