Lep`to*car"di*a (?), n. pl. [NL., fr. Gr. small + the heart.] Zool.

The lowest class of Vertebrata, including only the Amphioxus. The heart is represented only by a simple pulsating vessel. The blood is colorless; the brain, renal organs, and limbs are wanting, and the backbone is represented only by a simple, unsegmented notochord. See Amphioxus.

[Written also Leptocardii.]


© Webster 1913.

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