A medusa has a layer of muscles, more or less strongly developed, running in a circular direction on the surface of the subumbrella, the contractions of which are antagonized by the elasticity of the gelatinous substance of the body.
If a woman is experiencing contractions and makes no cervical change, then this is false labor.
On pure water the propagation of waves would be attended by temporary extensions and contractions of the surface, but these, as was shown by O.
Alex waited through some more contractions and finally pulled the foal straight out.
The history of Pomerania, as distinct from that of Pomerellen, consists mainly of an almost endless succession of divisions of territory among the different lines of the ducal house, and of numerous expansions and contractions of territory through constant hostilities with the elector of Brandenburg, who claimed to be the immediate feudal superior of Pomerania, and with other neighbouring rulers.