ß78 E* -PH. ALLIS, Lateral canals and cranial Jjones of Polyodon folium. 



12) Huxley, Thomas H., Preliminary essay upon the systematic ar- 



rangement of the fishes of the Devonian epoch, in: Mem. Greol. 

 Surv., Decade 10, London 1861. 



13) — , A Manual of the anatomy of vertebrated animals. New York 



1872. 



14) Klaatsch, H., Ueber die Herkunft der Skleroblasten. Ein Beitrag 



zur Lehre von der Osteogenese, in: Morphol. Jahrb., V. 21, 

 Heft 2, April 1894. 



15) Merkel, Fe., Ueber die Endigungen der sensiblen Nerven in der 



Haut der Wirbelthiere, Rostock 1880. 



16) MiNCKERT, W., Zur Topographie und Entwicklungsgeschichte der 



LoRENZixi'schen Ampullen, in: Anat. Anz., V. 19, No. 20, July 

 1901. 



17) Peabodt, James E., The ampullae of Lorenzini of the Selachii, in: 



Zool. Bull, V. 1, No. 4, December 1897. 



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V. 5, Anat., Heft 3 and 4, Oct. 1892. 



Explanation of Plate. 



Plate 28. 



Index letters. 



J^i Bridge's bone h^ soc supraorbital lateral sensory 



S^ „ „ b^ canal 



JO'Ä(7 extrascapular, or supratempo- SC(C^) supraclavicular; Bridge's 



ral bone bone c^ 



ioc infraorbital lateral sensory canal Sq squamosal lateral sensory os- 



Jiyc hyomandibular lateral sensory sides. 



canal 



Pig. 1. The dermal bones, somewhat broken, and related lateral 

 canals on the dorsal surface of the head of Polyodon. 



