MANDIBULAR ARTERY AORTIC ARCH 117 



culated region which strongly suggests a rudiment of a branchial 

 gill. The position of this vascular tissue, internal to the ante- 

 rior edge of the hyomandibula, is that of the mandibular pseudo- 

 branch in Amia and the Teleostei, but its relation to the 

 postspiracular artery above described would indicate that it is 

 a remnant of a hyal gill, and hence probably the disappearing 

 anterior hemibranch of that arch. 



Palais de Cainol^s, Meiton, France 

 August 1st, 1915 



LITERATURE 



Allis, E. p., Jr. 1897 The cranial muscles, and cranial and first spinal nervea 

 in Amia calva. Jour, of Morphology, vol. 12, Boston. 

 1900 The pseudobranchial circulation in Amia calva. Zoolog. Jahrb., 

 Abtheil. fiir Anat. und Ontog. der Thiere, Bd. 14, Heft 1. 

 1908 a The pseudobranchial and carotid arteries in the gnathostome 

 fishes. Zoolog. Jahrb. Abteil. fiir Anat. und Ontogenie der Tiere. 

 Bd.27, Heft 1. 



1908 b The pseudobranchial and carotid arteries in Polypterus. Anat. 

 Anz., Bd. 33, Hfts. 8/9. 



1911 a The pseudobranchial and carotid arteries in Polyodon spathula. 

 Anat. Anz., Bd. 39, Nos. 9/10. 



1911 b The pseudobranchial and carotid arteries in Chlamydoselachus 

 anguineus. Anat. Anz., Bd. 39, Nos. 19/20. 



1912 a The pseudobranchial and carotid arteries in Esox, Salmo and 

 Gadus, together with a description of the arteries in the adult Amia. 

 Anat. Anz., Bd. 41, No. 5 



1912 b The branchial, pseudobranchial and carotid arteries in Hep- 



tanchus (Notidanus) cinereus. Anat. Anz., Bd. 41, No. 17. 



1915 The homologies of the hyomandibula of the gnathostome fishes. 



(In press). 

 Balfour, F. M. 1881 A treatise on comparative embryology, vol. 2, London. 

 Carazzi, D. 1905 Sul sistema arterioso di Selache maxima e di altri Squalidi 



(Acanthias vulgaris, Mustelus vulgaris, Scyllium catulus, Scyllium 



canicula, Squatina vulgaris). Anat. Anz., Bd. 26. 

 DoHRN, A. 1885 Studien zur Urgeschichte des Wirbeltierkorpers. VII. Mit- 



teil. a. d. Stat. Neapel, Bd. 6, Heft 1. 



1886 Studien zur Urgeschichte des Wirbeltierkorpers. XI. Ibid., 



Bd.7, Heftl. 

 FtJRBRiNGER, K. 1903 Bcitriige zur Kenntnis des Visceralskelets der Selachier. 



Morph. Jahrb., Bd. 31, Hefts 2/3. 



