i44 EDWARD PHKLPS ALLIS, JUN. 



and nerves of vertebrates, and he considers tliera of sufficient 

 importance to ''suggest that his (ray) entire phylogenetic 

 scheme should be received with some reserve." One of these 

 apparent errors is tliat I have shown the oplithalraic nerves 

 in all my figures arising " from a common stem which lies 

 ventrally of the III nerve." The nerves in my diagrams are 

 all intended to be shown cut some distance after they issue 

 from their foramina, and I purposely avoided attempting to 

 show their relations at their exits. The data on which my 

 diagram was based were too meagre and too conflicting to 

 warrant my attempting to show anything that could possibly 

 be omitted. The other apparent error relates to the position 

 of that branch of the oculomotorius that innervates the rectus 

 superior in Petromyzon. I showed this branch in my figure 

 lying over instead of under the ramus ophthalmicus. " In the 

 text (p. 523) I called attention to the fact that Fiirbringer says 

 that it runs under the ramus ophthalmicus, but I assumed 

 this to be an error. As Corning says (14, p. 129) that he 

 has confirmed the correctness of Fiirbringer's statements, this 

 simply adds another and important variation to be accounted 

 for in the innervation of the eye-muscles. 



In my work on Scomber, still in press, I suggested that 

 the differences in the innervation of the rectus internus and 

 rectus inferior in that fish, and in Amia, might be explained 

 by the assumption that the internus of the one was the 

 inferior muscle of the other, ganoids and teleosts thus 

 representing different lines of descent from my proto-urodele 

 type. As, however, Workman (68) has recently shown that 

 the eye-muscles of Amiurus melas are innervated much as 

 they are in Amia, while in Pomatomus they are innervated 

 exactly as they are in Menidia, it is evident that it is 

 useless to speculate on the subject until further facts have 

 been accumulated. 



Trigemiuo-f acial Complex. 



The trigemino-facial ganglion is partly intra-cranial and 

 partly extra-cranial in position. The apparent roots by which 



