24 ALLIS. [VOL. I. 



the parasphenoid finally disappears entirely, as a separate 

 ossification, excepting only that part of it that forms the 

 anterior boundary of the internal carotid foramen; that 

 the cartilaginous, anterior clinoid wall of Amia ossifies 

 independently; that the alisphenoids instead of the petrosals 

 invade, on each side of the head, the region between the 

 foramina of the trigeminal and facial nerves; and that the 

 postorbital ossification, as the hind end of the skull is flexed 

 downward, descends onto the dorsal surface of the petrosal 

 and fuses with it as a part of the periotic mass,-- an arrange- 

 ment would arise so markedly similar to that found in the 

 human skull that the several homologies I have here sought 

 to establish seem much more than simply probable. To defi- 

 nitely establish them, and to show whether the apparently 

 interneural position of the several bones in Amia is really of 

 vertebral significance or not, evidently still requires a wide 

 range of careful anatomical and embryological work. 



PALAIS CARNOLES, MENTON, 

 March 24, 1897. 



BIBLIOGRAPHY. 



1. ALLIS, EDWARD PHELPS, JR. The Anatomy and Development of the 



Lateral Line System in Amia Calva. Journ. of Morph. Vol. ii, 

 No. 3. April, 1889. 



2. ALLIS, EDWARD PHELPS, JR. The Cranial Muscles and Cranial and 



First Spinal Nerve in Amia Calva. Journ. of Morph. Vol. xii, 

 No. 3. 1896. 



3. BARDELEBEX, K. vox. Knochen, Bander, Muskeln. Erg. der Ana/. 



und Entwicklungsgeschichte. Bd. i. 1891, 1892. 



4. BARDELEBEX, K. vox. Ueber das Praefrontale und Postfrontale des 



Menschen. Anat. Anz. Ergdnzungsheft sum xii. Band. 1896. 



5. BAUR, G., and CASE, E. C. On the Morphology of the Skull of the 



Pelycosauria and the Origin of the Mammals. Anat. Anz. Bd. 

 xiii, Nos. 4, 5. Jan. 30, 1897. 



6. BEARD, J. The System of Branchial Sense Organs and their Asso- 



ciated Ganglia in Ichthyopsida. A Contribution to the Ancestral 

 History of Vertebrates. Studies from the Biological Laboratories 

 of The Owens College. Vol. i. 1886. 



