304 REFERENCES. 



dam, 1882) are not homodynamous with the true somites. He 

 was followed in this respect by RABL (Theorie des Mesoderms. 

 Morphologisches Jahrbuch, XV. 1889). 



80 KORSCHELT, E., und HEIDER, K. Lehrbuch der vergleichen- 

 den Entwicklungsgeschichte der ivirbellosen Thiere. 3d Heft. 

 Jena, 1893. 



8 1 KOWALEVSKY, ALEXANDER. Entwicklungsgeschichte des Am- 

 phioxus lanceolatus. Mem. de 1'Acad. Imp. des Sciences de St. 

 Pdtersbourg. VII. Series. T. XI. No. 4. 1867. Three 

 plates. 



82 KOWALEVSKY, ALEXANDER. Weitere Studien uber die Ent- 

 wicklungsgescJiidite des Ampliioxus lanceolatus, nebst einem 

 Beitrage zitr Homologie des Nervensy stems der Wurmer and 

 Wirbelthiere. Arch. f. Mikr. Anat. XIII. 1877. pp. 181-204. 

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Among the definite discoveries communicated by Kowalevsky 

 in these two memoirs may be mentioned the following : General 

 features of segmentation and gastrulation, origin of mesoderm 

 from archenteric pouches, unique method of formation of 

 nerve-tube (see text), origin of notochord, neurenteric canal, 

 asymmetrical origin of gill-slits and mouth, and in part the 

 metamorphosis. 



83 KUPFFER, CARL VON. Die Entivicklung von Petroinyzon 

 Planeri. Arch. f. Mikr. Anat. XXXV. 1890. pp. 469-558. 

 Six plates. 



Origin of head-cavities, hypophysis, etc. 



84 KUPFFER, CARL VON. Die Entwicklnng der Kopfnerven der 

 Vertebraten. Verhandl. Anat. Gesellschaft in Miinchen. 1891. 

 pp. 22-55. Eleven figures. (Erganzungsheft zum Anat. Anz. 

 VI. 1891.) 



Ammocoetes (see Fig. 92 in text). 



85 KUPFFER, CARL VON. Studien zur vergleichende Entwick- 

 lungsgeschichte des Kopfes der Kranioten I. Die Entwicklung 

 des Kopfes von Acipenser sturio an Medianschnitten untersucht. 

 pp. 95. Nine plates. Seven figures in text. Miinchen and 

 Leipzig, 1893. 



Important contribution to the delimitation of the wall of the 

 brain. On page 84 is a reconstruction of head-cavities of Am- 

 mocoetes (see Fig. 72). Figs. 21 and 22 in the plates repre- 

 sent cerebral vesicle of Amphioxus. (Cf. Fig. 51.) 



86 LANKESTER, E. RAY, and WILLEY. A. The Development of 

 the Atrial Chamber of Amphioxus. Quarterly Jour. Micro. Sc. 

 XXXI. 1890. pp. 445-466. Four plates. 



