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Notes absence of blood-corpuscles in Amphioxus. Those 

 described by previous authors must therefore require another ex- 

 planation. 



21 DOHRN, ANTON. Studieti zur UrgescJiichte des ll'irbelthier- 

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 der Selachier. Mitth. Zool. Stat. Neapel. V. 1884. pp. 141-151. 

 Taf. 8. Figs, i and 2. 



22 EisiG, HUGO. Die Segmentalorgane der Capitelliden. Mitth. 

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Discovery of numerous nephridia in single segments and an- 

 astomoses between successive nephridia. 



23 EMERY, CARLO. Le specie del genere Fierasfer nel Golfo di 

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 Neapel." Leipzig, 1880. 



24 EMERY, CARLO. Zur Morphologie der Kopfniere der Teleostier. 

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 Zoologischer Anzeiger, VIII. 1885. pp. 742-744. 



25 FUSARI, ROMEO. Beitrag sum Studiuin des peripherischeu 

 Nervensy stems von Amphioxus lanceolatus. Internationale Mo- 

 natsschrift fiir Anatomic und Physiologic, VI . 1889. pp. 120-140. 

 Taf. VII.-VIII. 



26 GOODSIR, JOHN. On the Anatomy of Atnphioxus lanceolatus. 

 Transactions of the Royal Society of Edinburgh, Vol. XV. Part I. 

 1841. pp. 241-263. 



27 GRENACHER, H. Beitrage zur n'dhern Kenntniss der Muscu- 

 latur der Cyclostomen und Leptocardier. (Leptocardia proposed 

 by Haeckel as a classificatory name on account of the simple 

 tubular " heart " of Amphioxus.) Zeitschr. fiir Wiss. Zoologie, 

 XVII. 1867. pp. 577-597. Taf. XXXVI. First isolation of 

 muscle-plates of Amphioxus. 



28 GUNTHER, ALBERT. Synopsis of Genus Branchiostoma. In 

 Report on Zool. Collections of H. M. S. Alert. 1881-82. pp. 31- 

 33. London, 1884. 



29 HATSCHEK, BERTHOLD. Die Metamerie des Amphioxus und 

 des Ammocastes. Verh. Anat. Gesellschaft, 6th Versammlung. 

 Wien, 1892. pp. 137-161. Eleven figures in text. 



29 bis. HATSCHEK, BERTHOLD. Zur Metamerie der Wirbelthiere. 



Anat. Anz. VII. Dec. 1892. pp. 89-91. 



30 HUXLEY, T. H. Preliminary Note upon the Brain and Skiell 

 of Amphioxus lanceolatus. Proceedings of the Royal Society, 

 XXIII. 1874. pp. 127-132. 



Points out that in Myxine and Ammocoetes a velum is present 

 separating the buccal (stomodoeal) from the branchial cavity. 



