Roots: Strong, deeply fixed in the earth, but not laterally.
Laterally each is united with the pterygoid and opisthotic of its side.
The whole body is depressed, instead of laterally compressed.
The U-tube holding the specimen may be adjusted up and down, and laterally.
In the Sea Snakes (Hydrophid), it is laterally much compressed.
When it contracts, it flexes the ...