OF DENISON UNIVERSITY. 
43 
much more angular and irregular than the equally large cells of the 
third nidulus. The nidulus of the fourth also lies immediately dorsad 
of the dorso-nredian fasciculus under the aqueduct, but considerably 
caudad of the third. It is not in contact with the nidulus of the third, 
neither is it separated from it by fibres of the dorso-median fasciculus, 
as in Arctomys (Vol. V, Plate X, Fig. i.) The fibres take the usual 
course to the value of Vieussens. The course of the fifth has not been 
traced in detail. The sixth nerve springs, as in Arctomys (Vol. V, 
Plate XVII, Fig. 2,) from a small nidulus in the loop formed by the 
genu of the seventh. Its fibres descend in several fascicles to a com- 
mon exit. The seventh takes the usual course, passing first to the 
genu, which projects into the ventricle entad of the nidulus of the 
sixth, then turning abruptly ventrad in many strands to its nidulus in 
the ventral part of the medulla. The course of the eighth agrees pretty 
closely with Arctomys, as described by Prof. Tight in Vol. V, pages 
58 and 59. The nidulus of the root of the eighth nerve lies cephalad 
and dorsad of most of the fibres as they enter the medulla. The 
fibres of the most cephalic portion of the root pass through this nidu- 
lus and into the cerebellum. A little farther caudad fibres pass di- 
rectly mesad under the caudal crus of the cerebellum as it enters the 
restiform body, some turning up into the cerebellum, some passing 
farther mesad toward the ventricle. Farther caudad these fibres pass 
through DeitePs nidulus, then mesad to the eminentia acustica. 
Deiter’s nidulus lies immediately entad of the crus of the cerebellum 
at this point, with large deeply staining multipolar cells. Still farther 
caudad the great mass of the fibres of the eighth pass up and arch over 
the crus of the cerebellum directly into the eminentia acoustica, 
Deiter’s nidulus having disappeared. The ninth and tenth roots are 
as hard to distinguish internally as externally. Their fibres pass dor- 
so-rnesad to a nidulus near the floor of the ventricle. The eleventh 
was not traced. The twelfth niduli lie immediately below the ventricle 
at the region of the calamus scriptorius. Their large multipolar cells 
lie in a clear stroma, and the two niduli are confluent in the meson. 
The fibres descend in many bundles to their exits, passing by the 
olives on the cephalo-lateral aspects of the latter. 
