CRANIAL NERVES OF CHIMERA MONSTROSA. 641 



Harriotta. The lateral line system of this interesting fish resembles that of Chimsera in 

 practically every respect, there being only two differences worth noting. These are : 

 (1) The elongated snout has produced modifications of both supra- and infra- orbital 

 canals ; (2) both divisions of the hyomandibular (operculo-mandibular) canal meet their 

 fellows in the mid- ventral line. Both differences are of little importance, especially the 

 latter, since more or less marked traces of this fusion are to be seen in Chimsera. 



Seeing that the geography of the lateral line system of Chimsera has been so 

 frequently figured and described, it would be superfluous on my part to add to those 



Figure of Sensory Canals of Chimsera monstrosa, to enable a comparison to be made between Garman's 

 nomenclature and the innervation of the system. The latter is indicated by the different kinds of 

 shading. 



(1) Supra-orbital canal (superficial ophthalmic — cross-hatched — the white segment is the portion inner- 



vated by the profundus) = cranial (C) + rostral (R) + sub-rostral (SR). 



(2) Infra-orbital canal (buccal + otic — dotted) = orbital (Ok) + sub-orbital (SO) + portion of angular 



(A) + nasal (N). 



(3) Hyomandibular or Operculo-mandibular canal (external mandibular — white) = remainder of angular 



(A) + oral (0) + jugular (J). 



(4) Lateralis canal (lateralis — oblique shading) = lateral (L) + occipital (0c) + aural (Au) + post-aural 



(PAtj.). 



descriptions here. As, however, the innervation of the system is in this communication 

 described for the first time, I may say a few words upon it in this section. 



A glance at the figure and description will enable the reader to sufficiently understand 

 the facts without any further explanation. It will then be seen what justification there 

 is for Garman's statement that " the most convenient designations for the different 

 canals, or parts of canals, are those derived from the names of the portions of the body 

 traversed by them, or from those of the organs near which they pass." From his 

 description and figure it is difficult to define the boundary between the cranial and 

 rostral canals, but the latter probably begins at that portion of the supra-orbital 

 innervated by the profundus. Avery interesting variation is noted by Garman, in that 



