304 REFEREXCES. 



dam, 1S82) are not homodynamous with the true somites. He 

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

 Morphologisches Jahrbuch, XV. 1SS9). 



80 KORSCHELT, E., und Heider, K. LehrbucJi der vergleicheti- 

 den Entwicklungsgeschichte der wirbellosen TInere. 3d Heft. 

 Jena, 1893. 



81 KowALEVSKY, ALEXANDER. Ejitivicklungsgeschichie des Am- 

 phioxiis lanceolatus. Mem. de I'Acad. Imp. des Sciences de St. 

 P^tersbourg. VII. Series. T. XI. Xo. 4. 1S67. Three 

 plates. 



82 KowALEVSKY, ALEXANDER. Weitci-e Stiidieii ubcr die Ent- 

 wicklujigsgesclnclde des Ainphioxus lanceolatus, nebst einem 

 Beitrage zur Hoinologie des Nervensystems der M'uriner und 

 IVirbelthiere. Arch. f. Jlikr. Anat. XIII. 1877. pp. 181-204. 

 Two plates. 



Among the definite discoveries communicated by Kowalevsky 

 in these two memoirs may be mentioned the toUowing : General 

 features of segmentation and gastrulation, origin of mesoderm 

 from archenteric pouches, unique method of formation of 

 nerve-tube (see te.xt), origin of notochord. neurenteric canal, 

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

 metamorphosis. 

 Z-y, KuPFFER, Carl \'0N. Die Entiuicklung von Petromyzon 

 Planeri. Arch. f. IMikr. Anat. XXXV. 1S90. pp. 469-558. 

 Six plates. 



Origin of head-cavities, hypophysis, etc. 



84 Kupffer, Carl von. Die Entwicklung 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. Stndien zur vergleichende Ent-viek- 

 lungsgeschichte des Kopfes der Kranioten I. Die Entwicklung 

 des Kopfes von Acipcnser sti/rio an Medianschnitten untersucht. 

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

 Leipzig, 1893. 



Important contribution to the delimitation of the wall of the 

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

 mocretes (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. Ouarterlv Jour. Micro. Sc. 

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



