280 EDWARD PHELPS ALLIS, JUN. 



Amia pins the portio ophtlialinici profundi of that fish, these 

 two components being found in varying- proportions. 



The ramus ophthahnicus superficialis of sehichians probably 

 always contains the same three components, or portiones, that 

 are found in the superficial ophthalmic nerve of Amia, but 

 the portio ophthalmici profundi, called in selachians the 

 portio trigemini, is usually small and may be reduced to a few 

 fibres only (Rays, Ewart). The portio trigemini of Amia is 

 represented in selachians, as stated above, by those fibres of 

 the so-called portio facialis that arise from the lobus trigemini ; 

 that is, by the fibres that form the so-called dorsal root of 

 Trigeminus II. 



The terminal buds of ganoids and tel costs, the nerve -sacs 

 of Acipenser, and the ampulhe of selachians, are in all proba- 

 bility homologous structures. 



LiTERATUEE. 



1. Alcock, R. — " The Periplieral Distribution of the Cranial Nerves of 



Amniocnetes. I. The Braiicliial Nerves, and the Innervation of tiie 

 Lateral Line System," 'Journ. of Anat. and Pliys.,' vol. xxxiii; 

 N. S., vol. xiii, pt. i, pp. 131—153, October, 1S98. 



2. Allis, Edward Phelps, jun. — " Tiie Anatoir^y and Development of the 



Lateral Line System in Amia calva," 'Journ. of Morph.,' vol. ii, 

 No. 3, April, 1889. 



3. Allis, Edward Phelps, jun. — "The Cranial Muscles and Cranial and 



First Spinal Nerves in Amia calva," 'Journ. of Morph.,' vol. xii. 

 No. 3, March, 1897. 



4. Allis, Edwaud Phelps, jun. — "A Reply to certain of Cole's Criti- 



cisms of my work on Amia calva," ' Anat. Anz.,' Rd. xv, Nos. 19, 20, 

 pp. 3G4— 379, February 24th, 1899. 



5. Allis, Edward Phelps, jun. — "An abnormal Musculus obliquus 



superior in Carcharias," 'Anat, Anz.,' Bd. xvi, No. 24, December 19th, 

 1899. 



6. Allts, Edward Phelps, jun. — "The Lateral Sensory Canals of Poly p- 



terus biciiir,". ' Anat. Anz.,'Bd. xvii, No. 23, June 2Ist, 1900. 



7. Alt-is, Edward Phelps, jun. — "The Skull and the Cranial and First 



Spinal Muscles and Nerves of Scomber scomber. (In press.) 



