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Webster's 1913 Dictionary

LEPTOCARDIA

Lep `to *car "di *a, n. pl. Etym: [NL. , fr. Gr. (Zoöl.)

 

Defn: 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.]

 

LEPTOCARDIAN

LEPTOCARDIAN Lep `to *car "di *an a. (Zoöl.)

 

Defn: Of or pertaining to the Leptocardia. -- n.

 

Defn: One of the Leptocardia.