358 F. H. EDGEWORTH 



Sphincter oesophagi et Lepidosiren. Constrictor pharyngis et 



laryngis. laryngis, Wiedersheim. 



Constrictor pharyngis, 

 Agar. 

 Constrictor oesophagi. Ceratodus, present. 



Protopterus, ? 

 Lepidosiren, ? 

 Dilatator laryngis. Ceratodus. Not a separate muscle. 



Protopterus. Dilatator, Wiedersheim. 

 Pharyngo-laryngeus, 

 Goppert. 

 Lepidosiren. Dilatator, Wiedersheim. 

 Constrictor laryngis. Ceratodus, present. 



Protopterus. Sphincter laryngeus, Gop- 

 pert. 

 Lepidosiren, ? 



Literature. 



''Agar, W. E. (1907). — "The Development of the Anterior Mesoderm and 



Paired Fins with their Nerves, in Lepidosiren and Protopterus ", 



' Trans. Roy. Soc. Edin.', vol. xlv, part iii. 

 Edgeworth, F. H. (1920). — " On the Development of the Hypobranchial 



and Laryngeal Muscles of Amphibia ", ' Journ. Anat.', vol. liv. 

 ' Fiirbringer, K. (1904). — " Beitriige zur Morphologie des Skeletes der 



Dipnoer, nebst Bemerkungen iiber Pleuracanthiden, Holocephalen, und 



Squaliden ", ' Semon's Forschungsr.', Bd. i, Lief. iv. 

 •^ -M. (1897).— " Ueberdio spino-occipitalen Nerven der Selachier und 



Holocephalen ", ' Festschr. f. Gegenbaur ', iii. 

 •^ Goppert, E. (1004). — "Der Kehlkopf von Protopterus annectens ", 



' Festschr. f. Haeckel '. 

 Greil, A. (1907). — " Ueber die Bildung des Kopfmesoderms bei Ceratodus 



Forst.", ' Verhand. d. anat. Gesell.' 

 ' (1908 and 1913). — " Entwickelungsgeschichte des Kopfes und des 



Blutgefasssystems von Ceratodus forsteri ", ' Erster und Zweiter Theil. 



Semon's zool. Forschungsr.', Bd. i. 

 "^Humphry, G. M. (1872). — "The Muscles of Ceratodus", 'Journ. of 



Anat. and Phys.', vol. vi. 

 v/ (1872).—" The Muscles of Lepidosiren annectens, with the Cranial 



Nerves ", ibid. 

 - Hyrtl, J. (1845). — ' Lepidosiren paradoxa', Prag. 

 Jaquet, M. (1897-9). — " Contribution a I'anatomie comparce des systemes 



squelettaire et musculaire de Chimaera collei, Callorhynchus antarcticus. 



