Nos. IAND2.] ANATOMY OF SCOMBER SCOMBER. 239 



4, p. 538) ; or, if present, as represented by a few fibers, only, con- 

 tained in the two or more communicating sympathetic strands. 

 Whether it is wholly absent or wholly fused with the nervus trig- 

 eminus, the loss of the fibers belonging to it would naturally ac- 

 count for the small size, in Scomber, of the profundus root and 

 ganglion. 



It should here be noted that Hoffmann (No. 39, p. 287) says 

 that, in Acanthias embryos of from 45 — 50 mm. in length, the 

 Portio minor s. trigemini is a branch of the ramus ophthalmicus 

 profundus. The ramus ophthalmicus profundus is said to be an 

 independent nerve that arises from van Wijhe's ciliary ganglion, 

 that ganglion being connected with the brain by a dorsal root that 

 Hoffmann calls the thalamicus, the root and nerve together form- 

 ing the thalamo-ophthalmicus nerve. The ciliary ganglion here 

 referred to is said, after its formation, to fuse completely with 

 the trochleo-trigeminus anlage, and later to anastomose with the 

 nervus oculomotorius. This single ganglion in Acanthias thus 

 seems to represent the profundus and ciliary ganglia, together, of 

 my descriptions of Aniia, and hence necessarily also the radix 

 longa, which connects the two ganglia. It must also represent the 

 two ganglia described by Mitrophanow (No. 46), in Acanthias, as 

 the ciliary and oculomotorius ganglia, which, as already stated in 

 my earlier work (No. 4, p. 537), are probably the homologues of 

 the two ganglia of Anita. The nerve called by Hoffmann in Acan- 

 thias the Portio minor s. trigemini would therefore seem to be 

 the homologue of the portio ophthalmici profundi trigemini of 

 Amia, and not of the ramus ophthalmicus superficialis trigemini. 

 The Portio major s. facialis of the nervus ophthalmicus super- 

 ficial of his descriptions is naturally the ramus ophthalmicus super- 

 ficialis facialis of my descriptions. 



The radix longa (;7) of Scomber, after its separation from the 

 ciliaris longus, is sometimes represented by one strand, and some- 

 times by two, one of which is probably sympathetic. It runs for- 

 ward, or downward and forward, lateral to the rectus superior, 

 between it and the rectus externus, and enters the ciliary ganglion. 

 From this ganglion the ciliaris brevis (cb) runs onward, parallel 

 at first to the nerve that innervates the rectus internus, and then 

 parallel to the nervus opticus, and enters the eyeball not far from 



