CoGHiLL, Cranial Netves of Ambly stoma. 285 



from the ventral side of the medulla or cord as typical ventral 

 spinal roots. 



21. Ganglia may or may not occur on the roots of the 

 first and second spinal nerves in Urodela. 



22. I have found no evidence that the lateral line organs 

 of Amblystoma are innervated by any but lateralis fibers from 

 the lateralis roots of the seventh and tenth nerves. The fibers 

 of this system are large and heavily medullated. 



23. The variations, which are described in Part First, in 

 the relations of the eye-muscle nerves, in the r, palatinus, in 

 the roots of the nerves, and in other cases not described in the 

 text, show that great caution should be exercised in researches 

 upon the nervous system of Urodela not to record accidental 

 variations as constant characteristics of the species. Especially 

 is this true in the study of young larvae, in which many of the 

 organs are in an extremely transitory state. 



24. The components of the cranial nerves of Gym- 

 nophiona, Amphiuma, Siren, and other Urodela are not ade- 

 quately known. Dissections show that in these forms there 

 are important features which must be accurately worked out 

 before the morphology of important rami of the amphibian 

 facialis and trigeminus can be properly understood. 



Brown University, March ji, igo2. 



LITERATURE CITED. 



'97. Allis, Edward Phelps. The Cranial Muscles and Cranial and First 

 Spinal Nerves in Amia Calva. Jottr. Morph., XII, 3. 



'00. Bowers, Mary A. Peripheral Distribution of the Cranial Nerves of 

 Spelerpes bilineatus. Proc. Am. Acad. Sc, XXXVI, II. 



'91. BuRCKHARDT, RuD. Untersuchungen am Hirn und Geruchsorgan von 

 Triton und Ichlhyophis. Zeitschrift f. wtssen. ZooL, LII, 3. 



'01. CoGHiLL, G. E. The Rami of the Fifth Nerve in Amphibia, /our. 

 Comp. Neurology, XI, I. 



'96. Cole, Frank J. On the Cranial Nerves of Chimera monstrosa (Linn. 

 •754) > with a Discussion of the Lateral Line System, and of the Mor- 

 phology of the Chorda Tympani. Trans. Roy. Soc. Edinburgh, 

 XXXVIII, Part III. 



