306 REFERENCES. 



94 RABL, CARL. Uber die Dtfferenzierungd.es Mesoderms. Anat. 

 Anz. III. 1888. pp. 667-673. Eight figures. 



Discovery of the sclerotome-diverticulum in embryo of Pristiurus. 



95 RICE, HENRY J. Observations upon the Habits, Structure, and 

 Development of Amphioxns lanceolatus. American Nat. XIV. 

 1880. pp. 171-210. Plates 14 and 15. 



Author was the first to find Amphioxus in Chesapeake Bay. 

 With regard to development, he gives some fairly good figures of 

 larva;, and observed some of the more obvious features of the 

 metamorphosis, as already described by Kowalevsky. 



96 RUCKERT, JOHANNES. Ueber der Entstehung der Excretions- 

 organe bei Selachiern. Arch, fur Anat. u. Physiol. (Anatomische 

 Abtheilung). 1888. pp. 205-278. Three plates. 



Contains also the discovery of segmental origin of gonads. 



97 SCHNEIDER, ANTON. Beitrage zur vergleichenden Anatomic 

 und Entivicklungsgeschichte der Wirbelthiere, II. Anatomic nnd 

 Entwickl. von Petromyzon nnd Ammoc&tes. 4. Ten plates. 

 Berlin, 1879. 



Figure of the ciliated grooves in pharynx of Ammocoetes, at 

 page 84. 



98 SCHULTZE, MAX. Beobachtung junger Exemplar e von Amphi- 

 oxus. Zeit. f. Wiss. Zool. III. 1851-2. pp. 416-419. 



Two larvae from Heligoland. Good description of structure of 

 notochord. 



99 VAN WIJHE, J. W. Ueber Amphioxus. Anat. Anz. VIII. 

 1893. pp. 152-172. 



100 WILLEY, A. On the Development of the Atrial Chamber of 

 Amphioxus. (Preliminary communication.) Proceedings of the 

 Royal Society, XLVIII. 1890. pp. 80-89. 



101 WILLEY, A. The Later Larval Development of Amphioxus. 

 Quarterly Jour. Micro. Sc. XXXII. 1891. pp. 183-234. Three 

 plates. 



102 WILSON, EDMUND B. On Multiple and Partial Development 

 in Amphioxus. Anat. Anz. VII. 1892. pp. 732-740. Eleven 

 figures . 



In this and the following more detailed paper, the author 

 describes and interprets a remarkable series of experiments on 

 the artificial production of twins and dwarfs. Besides this, there 

 are many important observations on the normal cleavage of the 



egg- 



103 WILSON, EDMUND B. Amphioxus and the Mosaic Theory of 

 Development. Journal of Morphology. VIII. 1893. pp. 579- 

 638. Ten plates. 



