THE SKULL OF CHIAMERA. 



141 



chondrocranium would then arise as a result of the anterior ends 

 of the trabecular turning dorsally anterior to the forebrain and 

 between the nasal sacs, and then again forward in their terminal 

 portions, represented in the median rostral process. 



The peculiar form of the chondrocranium of these fishes would 

 not then be primarily due to developmental adjustments to 

 feeding habits, but to the acquisition of feeding habits adapted 

 to anatomical conditions which were wholly independent of those 

 habits. 



Literature cited. 



Allis, E. P., Jr. — 1901. "The Lateral Sensory Canals, the Eye- 

 muscles, and the Peripheral Distribution of certain of 

 the Cranial Nerves of Mustelus lazvis" Quart. Journ. 

 Microsc. Sci. vol. xlv. London. 



. 1912. "The Branchial, Pseudobranchial and Carotid 



Arteries in Chimera (Hydrolagus) colliei." Anat. Anz. 

 Bd. xlii. Jena. 



. 1913. "The Homologies of the Ethmoidal Region of the 



Selachian Skull." Anat. Anz. Bd. xliv. Jena. 

 1914. "The Pituitary Fossa and Trigemino - facialis 

 Chamber in Ceratodus forsteri." Anat. Anz. Bd. xlvi. 

 Jena. 



. 1915. "The Homologies of the Hyomandibula of the 



Gnathostome Fishes." Journ. Morph. vol. xxvi. Phila- 

 delphia. 



. 1916. "The so-called Labial Cartilages of Raia clavata" 



Quart. Journ. Microsc. Sci. vol. lxii. London. 

 . 1917a. "The Homologies of the Muscles related to the 



Visceral Arches of the Gnathostome Fishes." (In press.) 

 . 1917 5. "The Lips and the Nasal Apertures in the 



Gnathostome Fishes." (In press.) 

 Bridge, T. W— 1898. "On the Morphology of the Skull in the 



Paraguayan Lepidosiren and in other Dipnoids." Trans. 



Zool. Soc. vol. xiv. part 5. London. 

 Coggt, A. — 1902. " Sviluppo degli orga/ni di senso laterale, delle 



Ampolle di Lorenzini e loro nervi rispettivi in Torpedo." 



Archiv. Zoolog. vol. i. fasc. 1. Napoli. 

 Cole, F. — 1896. "On the Cranial Nerves of Chirncera moristrosa, 



with a discussion of the Lateral Line System and of the 



Morphology of the Chorda tympani." Trans. Royal 



Soc. Edin. vol. xxxviii. Edinburgh. 

 Dean, B. — 1906. " Chimaeroid Fishes and their development." 



Carnegie Institute, Publ. 32. Washington. 

 Furbringer, K. — 1903. " Beitriige zur Kenntnis cles Visceral- 



skelets cler Selachier." Morph. Jahrb. Bd. xxxi. 



Leipzig. 



. 1 904. " Beitrage zur Morphologie des Skelets der Dipnoer 



nebst Bemerkungen iiber Pleuracanthiden, Holocephalen 

 und Squaliclen." Jenaisehe Denkschriften. Bd. iv. 

 Jena. 



