30 THE AMERICAN SILK WORM. 
istence of creatures of the form of Lelaps, Iguanodon, 
' and Hadrosaurus, would amply account for the well known 
foot-tracks of the Triassic Red Sandstone of the Connec- 
ticut Valley. The arguments adduced to prove that these 
were made by birds are equally applicable to their indica- 
ting the presence of Dinosaurians ; and as the latter have 
been found very much more nearly approximated in time 
—as Scelidosaurus in the Jurassic formation—the latter 
hypothesis is altogether the more probable of the two in 
the estimation of the writer. | 
gy 
THE AMERICAN SILK WORM. 
BY L. TROUVELOT. 
: WS 
The insect fauna of North America contains several gi- 
gantic species of moths belonging to the Lepidopterous 
family Bombycide. This family has long been known — 
to spin when in the larval, or caterpillar state, a cocoon 
which produces a large amount of silk, with a fibre of the 
most delicate texture, of great strength and of the most 
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