V., 1892.) heart differs in Limulus from the arrangement obtaining in Scorpio, in that a pair of lateral commissural arteries exist in Limulus (as described by Alphonse Milne-Edwards (6)) leading to a suppression of the more primitive direct connexion of the four pairs of posterior II.
It seems that there is a primitive tendency in the Arthropoda for the arteries to accompany the nerve cords, and a supra-spinal artery - that is to say, an artery in close relation to the ventral nerve cords--has been described in several cases.
arteries与发音含义,同义词,反义词,翻译,刑和更多的