THE SKULL OV CIlIM.fiRA. 141 



cliondroci'anium would then arise as a result of the anterior ends 

 of the trabecule turning doi-sally anterior to the forebrain and 

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

 portions, represented in the median ro.sti'al process. 



Tha 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 

 hiibits. 



Literature cited. 



Allls, E. p., Jr. — 1901. "The Lateral Sensory Canals, the Eye- 

 muscles, and the Peripheral Distribution of certain of 



the Cranial Nerves of JIustehcs lasvis." Quart. Journ, 



Microsc. Sci. vol. xlv. London. 

 . 1912. "The Branchial, Pseudobranchial and Carotid 



Arteries in Chimcera [Hijdrolagus) 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 oi Baia clavata." 



Quart. Journ. Microsc. Sci. vol. Ixii. London. 

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



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

 . 1917 6. "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. 

 CoGGi, A. — 1902. " Sviluppo degli organi 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 Chimcera monsirosa, 



with a discussion of the Lateral Line System and of the 



Morphology of the Chorda tympani." Trans, Royal 



Soc. Edin. vol. xxxviii. Edinburgh. 

 Dkan, B. — 1906. " Chimseroid Fishes and their development." 



Cai-negie Institute, Publ. 32. Washington. 

 FL'RBRiNGER, K. — 1903. " Beitriige zur Kenntnis des Visceral- 



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



Leipzig. 

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



nebst Bemei'kungen iiber Pleuracanthiden, Holocephalen 



und Squaliden." Jenaische Denkschriften, Bd. iv. 



Jena. 



