An introduction to the study of fishes

by Albert C. L. G. Günther

• Fam. 1. Chimaeræ.

Sub-classis V.—Marsipobranchii s. Cyclostomi.

Ordo I.—Hyperoartii.

• Fam. 1. Petromyzonini.

Ordo II.—Hyperotreti.

• Fam. 1. Myxinoidei.

Sub-classis VI.—Leptocardii.

Ordo I.—Amphioxini.

• Fam. 1. Amphioxini.

Discovery of Ceratodus.