Il8 STRONG. [Vol. X. 



could not be traced into the lateral line sense-organs. When 

 this was the case, the cause must be sought in defects in the 

 preparations, especially where the twigs are so excessively min- 

 ute. It may be reasonably inferred that all of these twigs end 

 in these organs, whose line the main facial branch follows so 

 closely, especially as an organ is always found in the vicinity 

 of a twig though the complete connection be not present. 

 This branch can be followed, gradually diminishing owing to 

 the separation of twigs, nearly to the very anterior extremity 

 of the head.i 



Returning to the other subdivision of the dorsal VII 

 (^VII b^, 751), this proceeds at first directly cephalad just 

 mesad of the lower part of the anterior extremity of the audi- 

 tory capsule, gradually leaving the Gasserian ganglion. As it 

 separates from the latter it receives a small, fine-fibred twig, 

 which can be traced around the Gasserian ganglion to the 

 sympathetic. Continuing cephalad and dorsad it is joined on 

 its ventral side (694) by the innermost of the three accessory 

 trigeminal branches. It here {^d)^) gives off a twig from its 

 dorsal side which proceeds caudad and ectad (^ VII b^^ coming 

 in contact (717) with a division of the middle of the three 

 trigeminal branches, which proceeds to meet it. The sub- 

 divisions of the latter pursue courses in part parallel to twigs of 

 the facial, i.e.^ both proceed ectad and caudad, the facial supply- 

 ing one (or more) lateral sense-organs lying above the space 

 between the anterior extremity of the auditory capsule and the 

 posterior surface of the eyeball, and also above the latter. 

 Thus a part of the middle of these trigeminal branches is 

 connected with one subdivision of the dorsal VII, and another 

 part with the other subdivision (PI. XII, A z). 



The innermost of these three trigeminal branches, after 

 coming in contact with the subdivision of the dorsal VII 

 (^VII^i, 694), passes dorsad along the inner side of the 

 latter, fusing temporarily with it. From the ventral side of 

 the facial branch a portion of the latter separates. This branch 



1 These sense organs in the tadpole, as is well known, are noticeable on the 

 exterior as rows of light dots. This appearance is owing to the absence of pig- 

 ment among their cells. They are not enclosed in canals, and each one is usually 

 slightly depressed. 



