A Guide to the Study of Fishes, Volume 1 (of 2)
img img A Guide to the Study of Fishes, Volume 1 (of 2) img Chapter 25 THE PROTOCHORDATA
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Chapter 1 THE LIFE OF THE FISH
Chapter 2 THE EXTERIOR OF THE FISH
Chapter 3 THE DISSECTION OF THE FISH
Chapter 4 THE SKELETON OF THE FISH
Chapter 5 MORPHOLOGY OF THE FINS
Chapter 6 THE ORGANS OF RESPIRATION
Chapter 7 THE NERVOUS SYSTEM
Chapter 8 THE ORGANS OF SENSE
Chapter 9 THE ORGANS OF REPRODUCTION
Chapter 10 EMBRYOLOGY AND GROWTH OF FISHES
Chapter 11 INSTINCTS, HABITS, AND ADAPTATIONS
Chapter 12 ADAPTATIONS OF FISHES
Chapter 13 THE COLORS OF FISHES
Chapter 14 THE GEOGRAPHICAL DISTRIBUTION OF FISHES
Chapter 15 ISTHMUS BARRIERS SEPARATING FISH FAUNAS
Chapter 16 DISPERSION OF FRESH-WATER FISHES[63]
Chapter 17 BARRIERS TO DISPERSION OF RIVER FISHES
Chapter 18 FISHES AS FOOD FOR MAN
Chapter 19 DISEASES OF FISHES
Chapter 20 THE MYTHOLOGY OF FISHES
Chapter 21 CLASSIFICATION OF FISHES
Chapter 22 THE HISTORY OF ICHTHYOLOGY
Chapter 23 THE COLLECTION OF FISHES
Chapter 24 THE EVOLUTION OF FISHES
Chapter 25 THE PROTOCHORDATA
Chapter 26 THE TUNICATES, OR ASCIDIANS
Chapter 27 THE LEPTOCARDII, OR LANCELETS
Chapter 28 THE CYCLOSTOMES, OR LAMPREYS
Chapter 29 THE CLASS ELASMOBRANCHII OR SHARK-LIKE FISHES
Chapter 30 THE TRUE SHARKS
Chapter 31 THE HOLOCEPHALI, OR CHIM RAS
Chapter 32 THE CLASS OSTRACOPHORI[152]
Chapter 33 ARTHRODIRES
Chapter 34 THE CROSSOPTERYGII
Chapter 35 SUBCLASS DIPNEUSTI,[164] OR LUNGFISHES
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Chapter 25 THE PROTOCHORDATA

The Chordate Animals.-Referring to our metaphor of the tree with its twigs as used in the chapter on classification we find the fishes with the higher vertebrates as parts of a great branch from which the lower twigs have mostly perished. This great branch, phylum, or line of descent is known in zoology as Chordata, and the organisms associated wit

             
            

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