300 REFERENCES. 



47 OWSJANNIKOW, PHILIP. Ueber das Centralnervensystem des 

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 Also in Melanges Biologiques, T. VI. pp. 427-450. 



Introduced a method of maceration by which he was able to 

 shake out the central nervous system and thus isolate it from the 

 body. In this way he was able to correct the erroneous descrip- 

 tions of de Quatrefages and others (who stated that there were 

 ganglionic enlargements in the spinal cord), and to discover the 

 alternate arrangement of the spinal nerves. 



48 PLATT, JULIA B. Fibres connecting the Central Nervous System 

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 284. Three figures in text. 



49 POLLARD, E.G. A New Sporozoon in Amphioxus. Quarterly 

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Unicellular parasites in intestinal epithelium. 



if) bis. POUCHET, GEORGES. On the Laminar Tissue of Amphioxus. 

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50 DE QUATREFAGES, ARMAND. Memoire sur le systems nerveux 

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First observation of passage of ova through atriopore ; and 

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51 RATHKE, HEINRICH. Bemerkungen uber den Bau des Amphi- 

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52 RETZIUS, GUSTAV. Zur Kenntniss des centralen Nervensy stems 

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52 bis. RETZIUS, GUSTAV. Das hintere Ende des Riickenmarks und 



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53 ROHDE, EMIL. Histologische Untersuchungen iiber das Nerven- 

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Standard work on the central nervous system of Amphioxus. 



54 ROHON, JOSEF VICTOR. Untersuchungen Yiber Amphioxus 

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