1 8 Journal of Comparative Neurology. 



ad in company with a portion of the VIII, enters, going dor- 

 sad of the spinal Vth to the fasciculus communis system. Vllaa 

 is well developed and its deep course and origin are as in Esox. 

 A slight endymal fusion occurs between the caudal portions of 

 the fasciculus communis systems. It is insignificant. 



In Lepomis, as in Roccus, the spinal Vth tract is very prom- 

 inent on the surface of the dorsal cornua. The roots of the 

 Xth pass ventrad of the tract and derive a component from it. 

 The isolated cephalic vago-glossopharyngeal root enters just 

 caudad of the lateral line nerve and near the beginning of the 

 fusion. 



In Perca (Figs. 12 and 19) also, the spinal Vth tract is 

 strongly pronounced, the fibers being grouped in two bundles. 

 The Xth nerve passes ventrad of it and receives a strong strand 

 of fibers from its dorsal division (Fig. 12). The cephalic root 

 enters as before described, dividing the spinal Vth tract in its 

 passage to the fasciculus communis. 



In Cottiis no spinal Vth component to the Xth was recog- 

 nized with certainty. The fusion of the acusticums was not 

 as strong as in the other three forms. 



In all the origin of Vllaa was as already described in Esox, 

 having a cephalic course after its formation before leaving the 

 brain. The fasciculus communis system was most developed in 

 Roccus and Lepomis, where, as in Esox, there was an indication 

 of two regions, dorsal and ventral. 



Isospondyli. A single species belonging to this order 

 was examined, the alewife, Clupea pseudoharengea, and the 

 study bestowed upon it at present only suffices to permit the 

 general relations of these regions being mentioned, A strong 

 fusion of the acusticum systems occurs and since these are 

 drawn cephalad under the cerebellum and the cerebellar crest is 

 also somewhat concentrated, the appearance produced is that of 

 two lobes of the cerebellum. The fasciculus communis is but 

 weakly developed, especially the preauditory portion of it. The 

 Xth arises by three large roots which penetrate the spinal fifth 

 tract to reach their central connections, the two more cephalic 

 also^^passing through the acusticum which extends caudad to 



