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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Amphioxus \Am'phi*ox"us\, noun [NL., fr. Gr. ? + ? sharp.] (Zo["o]l.) A fishlike creature ({Amphioxus lanceolatus}), two or three inches long, found in temperature seas; -- also called the {lancelet}. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebr[ae], nor red blood. It forms the type of the group {Acrania}, {Leptocardia}, etc.
From WordNet (r) 2.0 [wn]:
amphioxus
noun: small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates [syn: {lancelet}] [also: {amphioxi} (pl)]
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