MOTOR NUCLEI IN PHYLOGENY 485 
SELACHII 
Motor nucler in Selache maxima (Cetorhinus maximus) 
The basking shark is the largest of living fishes. It is a pelagic 
form of wide distribution and often gregarious habit, attaining a 
length of 35 to 40 feet (Jordan, Bridge, 1. c.). 
The general morphology of the brain is illustrated in figure 9 
and requires no further description in the present connection. 
Attention may be directed, however, to the marked transverse 
folding of the large cerebellum. The complexity of the folding 
Fig. 9 Brain of Selache maxima. A, lateral view; B, dorsal view; C, ventral 
view. X 3%. Abbreviations: N.l.l., nervus lineae lateralis; sp.occ., spino-occipi- 
tal roots; Sp.J., first spinal nerve; VIIJ.+1.1., acusticus and lateralis root; 
LI1,UL,IV,V,VI,Vil,IX,X, cranial nerves. 
