1895.] SENSOET CAJiTAL STSIEM OF WISHES. 285 



It crosses the ventral portion of the orbit, where a large branch 

 passes ofi which is connected by a fine commissure with the ramus 

 ophthalmicus profundus, and another with the main branch of the 

 buccahs. The buccalis innervates all the sense-organs lying in the 

 sub-orbital branch of the main sensory canal between the pores 18 

 to 24. The branches of the nerve lie dorsal to the ramus maxillo- 

 mandibularis. 



3. The ramus oticus has exactly the same course and distribution 

 as in Clarias, innervating the anterior part of the main canal ; the 

 centre of the canal is supplied by the glossopharyngeal, and the 

 posterior portion by branches from the lateral division of the vagus 

 (PL XVin. fig. 4). 



Tlie Facial, like as in Clarias, passes as a main branch through a 

 bony canal in the hyomandibular, and after running ventrally for 

 some short distance, divides into a ramus hyoideus and ramus 

 mandibularis, this latter branch innervating the mandibular portion 

 of the operculo-mandibular branch of the main sensory canal. It 

 would appear that the mandibular rami of the fifth and seventh 

 nerves are interchangeable as regards the innervation of the 

 mandibular portion of the operculo-mandibular branch of the main 

 sensory canal. 



Dorsal to the ramus hyomandibularis two small branches arise 

 (PI. XVIII. fig. 4, r.cZ.), which do not innervate any portion of the 

 sensory canal system and probably correspond to the branches x 

 and y of Pollard and form the ramus dorsahs. 



The Vagus has a similar distribution to that in Olarias. It lies 

 immediately behind the glossopharyngeal, but is distinctly inde- 

 pendent of it. 



4. Caxlichthts littoealis. 

 General Description. 



The following notes have been made from an external exami- 

 nation of three perfect specimens and the body of a fourth. As 

 I have not been able to inject the canals of the head or to examine 

 the skull in detail, the specimens I examined being required for 

 other purposes, I cannot criticise the account given by Pollard 

 (11. p. 533). It should, however, be borne in mind, when com- 

 paring his figure (pi. 36. fig. 4) with that given on PI. XIX. (fig. 6), 

 that the specimen he investigated was a young one only 3 cm. in 

 length. 



1. The Lateeai, Canai. commences by a pore at the base of the 

 fin-rays of the caudal fin. It passes forwards as a dermal canal 

 until it reaches the fifth dorsal shield from the head, -which it 

 enters and is conducted forwards through the fourth, third, and 

 second, passing into a small canal-bone instead of the first shield. 



2. The IMain^ Canal may be regarded as commencing in the 

 aforementioned canal-bone, in which it opens by two pores. 

 Passing into the squamosal it gives off a lateral and backwardly- 

 directed branch running from pore number 4 to 5 (PI. XIX. fig. 6). 



