SENSE ORGANS OF AMIURUS. 367 



surface of the skull a strong branch enters the nasal barblet, and 

 the rest passes toward the middle line, a branch being given off along 

 the medial border of the nasal sac as far as the extremity of the^snout. 

 (Fig. 4, PL IV.) 



The ramus ciliaris takes oi-igin from the ophthalmicus after that 

 nerve has separated from the trigeminal complex, but within the 

 cranial cavity, and partly also from the supero-lateral strand. It 

 escapes into the orbit by a foramen lateral to that for the R. ophthal- 

 micus prof 'nidus. Its branches there are partly represented in 

 Fig. 3, PI. IV. 



The ramus buccalis emerges through the same foramen as the 

 supero-lateral strand, but in a separate sheath. At its origin from 

 the trigeminal complex it is very closely connected with the ramus 

 ophthalmicus superfieialis, although it contains fibres other than those 

 derived from the tuberculum acusticum. In dissecting the ramus 

 maxillo-mandibidaris from the upper surface after reflection of the 

 eye, the ramus buccalis is found on the surface of that nerve. As it 

 courses forwards it divides into two branches, of which the deeper 

 and more medial accompanies the ramus maxillaris to the sub- 

 cutaneous tissue below and outside the nasal sac, and the lateral and 

 more superficial is destined for the infraorbital mucous canal. A 

 cutaneous branch becomes superficial at the posterior inferior angle 

 of the orbit (Fig. 3, PI. IV.), and afterwards communicates with a 

 cutaneous branch of the facial below the edge of the adductor man- 

 dibulce. 



The remaining branches of the fifth proper are formed from the 

 supero-lateral and infero-iuedial strands after they have emerged 

 from the skull. The mode in which this is effected may be seen 

 from Fig. 1, PL IV., which represents a dissection from the roof of the 

 mouth. 



Ramus cutaneus palatinus. — This small branch is derived from 

 the infer-o-medial strand just after its escape. It ramifies in the 

 mucous membrane of the roof of the mouth over the M. adductor 

 arcus palatini, but also sends a branch backwards to the mucous 

 membrane lining the gill-cover, and covering the adductores hyoman- 

 dibularis and operculi. 



Ramus palatinus. — This is a large branch of the infero-medial 

 .strand which runs forwards between the adductor arcus palatini and 

 the skull, beinw flattened between the ligamentous attachment of 



