Abstract

MEMOIR on “Chimæroid fishes and their Development,” by Prof. Bashford Dean, has been issued as Publication No. 32 of the carnegie Institution of Washington. It begiip wia short review of the researches in comparative a hatomy and palæontology, which led to the vew the chimæroid fishes are the most primitive vertebrates or the the least modified descendants of the ancestral cranium- or jaw-bearing vertebrate; that, althougn stfark-like, they are nevertheless widely distinct from the shark; and that altogether they represent a lower plane in piscine evolution.

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