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(55) Al. Agassiz. “On the young Stages of some Osseous Fishes. I. Development of the Tail.” Proceedings of the American Academy of Arts and Sciences, Vol. XIII. Presented Oct. 11, 1877.
(56) Al. Agassiz. “II. Development of the Flounders.” Proceedings of the American Acad. of Arts and Sciences, Vol. XIV. Presented June, 1878.
(57) K. E. v. Baer. Untersuchungen über die Entwicklungsgeschichte der Fische. Leipzig, 1835.
(58) Ch. van Bambeke. “Premiers effets de la fécondation sur les œufs de Poissons: sur l'origine et la signification du feuillet muqueux ou glandulaire chez les Poissons Osseux.” Comptes Rendus des Séances de l'Académie des Sciences, Tome LXXIV. 1872.
(59) Ch. van Bambeke. “Recherches sur l'Embryologie des Poissons Osseux.” Mém. couronnés et Mém. de savants étrangers de l'Académie roy. Belgique, Vol. XL. 1875.
(60) E. v. Beneden. “A contribution to the history of the Embryonic development of the Teleosteans.” Quart. J. of Micr. Sci., Vol. XVIII. 1878.
(61) E. Calberla. “Zur Entwicklung des Medullarrohres u. d. Chorda dorsalis d. Teleostier u. d. Petromyzonten.” Morphologisches Jahrbuch, Vol. III. 1877.
(62) A. Götte. “Beiträge zur Entwicklungsgeschichte der Wirbelthiere.” Archiv f. mikr. Anat., Vol. IX. 1873.
(63) A. Götte. “Ueber d. Entwicklung d. Central-Nervensystems der Teleostier.” Archiv f. mikr. Anat., Vol. XV. 1878.
(64) A. Götte. “Entwick. d. Teleostierkeime.” Zoologischer Anzeiger, No. 3. 1878.
(65) W. His.. “Untersuchungen über die Entwicklung von Knochenfischen, etc.” Zeit. f. Anat. u. Entwicklungsgeschichte, Vol. I. 1876.
(66) W. His. “Untersuchungen über die Bildung des Knochenfischembryo (Salmen).” Archiv f. Anat. u. Physiol., 1878.
(67) E. Klein. “Observations on the early Development of the Common Trout.” Quart. J. of Micr. Science, Vol. XVI. 1876.
(68) C. Kupffer. “Beobachtungen über die Entwicklung der Knochenfische.” Archiv f. mikr. Anat., Bd. IV. 1868.
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(70) M. Lereboullet. “Recherches sur le développement du brochet de la perche et de l'écrevisse.” Annales des Sciences Nat., Vol. I., Series IV. 1854.
(71) M. Lereboullet. “Recherches d'Embryologie comparée sur le développement de la Truite.” An. Sci. Nat., quatrième série, Vol. XVI. 1861.
(72) T. Oellacher. “Beiträge zur Entwicklungsgeschichte der Knochenfische nach Beobachtungen am Bachforellenei.” Zeit. f. wiss. Zool., Vol. XXII., 1872, and Vol. XXIII., 1873.
(72*) H. Rathke. Abh. z. Bildung u. Entwick. d. Menschen u. Thiere. Leipzig, 1832-3. Part II. Blennius.
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[20] Vide Vol. II. p. 108.
[21] In addition to the paper by Alex. Agassiz (No. [55]) vide papers by Huxley, Kölliker, Vogt, etc.
[22] Vide Agassiz (No. [56]) and Steenstrup, Malm.
CHAPTER V.
CYCLOSTOMATA[23].
Petromyzon is the only type of this degenerated but primitive group of Fishes the development of which has been as yet studied[24].
The development does not however throw any light on the relationships of the group. The similarity of the mouth and other parts of Petromyzon to those of the Tadpole probably indicates that there existed a common ancestral form for the Cyclostomata and Amphibia. Embryology does not however add anything to the anatomical evidence on this subject. The fact of the segmentation being complete was at one time supposed to indicate an affinity between the two groups; but the discovery that the segmentation is also complete in the Ganoids deprives this feature in the development of any special weight. In the formation of the layers and in most other developmental characters there is nothing to imply a special relationship with the Amphibia, and in the mode of formation of the nervous system Petromyzon exhibits a peculiar modification, otherwise only known to occur in Teleostei and Lepidosteus.