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The Lateral Line System in Siluroids. 

 By 



H. ß. Pollard, B. A. B. Sc, Scholar of Ch. Ch. Oxford. 

 (Aus der anatomischen Anstalt in Freiburg i. B.) 



With plates 35—36. 



The stimulus to the production of the present paper was given 

 by Prof. Huxley's "Essay on the classification of Devonian fish" com- 

 bined with the fact, that Prof. Wiedersheim possessed at his labora- 

 tory considerable material of Siluroids. The work has been completed 

 in the ''Anatomische Anstalt" at Freiburg i. B. 



It is again my pleasing duty to express my deep gratitude to 

 Prof. Wiedersheim for his continued and absolutely unstinted libe- 

 rality and to the Governing Body of Ch, Ch. Oxford for funds to 

 enable me to proceed with the work. 



Tlie specimens herein examined and described comprise : 

 Clarias — several specimens. 

 CallicMhjs paleatus Ienyas, Porto Allègre. 

 Auchenaspis hiscutaius Geoffr., Cameroon. 

 Trichomycterus tenuis (or Pygidium tenue) Weyenbergii, Sierra 



de Cordoba. 

 Chaetostomus guairensis Steind., Caracas. 

 Other forms were examined but not cut in sections and are not 

 here described. 



In Prof. Wiedersheim's name, thanks are due to Herr Geh. Rath 

 Mr)Bius of Berlin and Dr. Günther of the British Museum for their 

 very great kindness in sending most valuable material. 



Clarias. 



The following description is mainly based on the examination of 

 a nearly adult specimen. The cranium without the lower jaw was 



Zoul. Jahrb. V. Abth. (. Morph. 35 



