MUSTEf.US L.EVIS. 155 



the supra-orbital canal, distal to the point where the canal 

 anastomoses with the anterior end of the infra-orbital canal. 

 The fibres destined to supply the organs leave the main nerve 

 in several branches, all of which run forwai-d to their destina- 

 tion, neither any of them, nor the main nerve itself, having a 

 recurrent course, such as Ewart shows in his fig. 2. Ewart 

 has here, I think, combined the profundus and certain of the 

 terminal branches of the ophthalmicus superficialis, for the 

 profundus turns backward in the manner shown by him for 

 the superficialis, and Mr. Nomura, in his first dissection, con- 

 sidered it as the distal end of the latter nerve. 



This ventral part of the main ophthalmic nerve, iu the 

 region where the lateral sensory branch to organs 35 to 58 is 

 given off, comes into intimate juxtaposition with the ramus 

 ophthalmicus profundus, and so lemains through about 100 

 sections. There Avas here, apparently, no interchange of 

 fibres, but the relations of the two nerves are much too 

 intimate for me to assert that it docs not take place. One 

 lateral sensory branch, the one to organs 55 and 56 supra- 

 orbital, also here comes into such close relations with the pro- 

 fundus that it is impossible to say that it does not join it, 

 instead of joining the ophthalmicus supeificialis. Neverthe- 

 less, I should certainly have decided that it did not join the 

 profundus were it not that Cole finds, in Chimasra, a lateral 

 branch that has its apparent origin from the profundus, and 

 that supplies two supra-orbital organs lying in a part of the 

 canal that is strikingly similar to that in which my organs 55 

 and 56 are found. The exact innervation of these two oro-ans 

 is morphologically too important not to demand further in- 

 vestigation. 



Near the anterior end of the nasal capsule the profundus 

 nerve separates from the superficial ophthalmic one, turns 

 downward around the anterior end of the nasal capsule, and 

 then backward along its ventral surface. The main super- 

 ficial ophthalmic nerve now acquires a position close to, and 

 ventral or ventro-lateral to, the dorso-lateral rostral bar of 

 cartilage, the separate, general sensory branch acquiring 



