โ Scribed by Herrick, C. Judson
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A ganglionated nerve connected with the forebrain and intimately associated with the nervus olfactorius has been described in nearly all groups of fishes. The first clear description of such a nerve is that of Pinkus ('94) for Protopterus. It was termed the nervus terminalis by Locy, i n 1905, and accurately described in twenty genera (27 species) of selachians, and it was mentioned by Allis ('97) as occurring in Amia. Brookover ('08) has described it more fully in Amia and Lepidosteus and at the meeting of the Bssociation of American Anatomists in Baltimore, December, 1908, Brookover and Sheldon reported the presence of a similar nerve in the teleosts. Further literature on the subject is cited by the authors mentioned.
Ernst de Vries ('05) described a transitory ganglion on the vomeronasal nerve of mammals and suggested that the nerve of the organon voineronasale (Jacobson's organ) of higher vertebrates is homologous with the n e m s terminalis of fishes. Since, however, the organon vomeronasale of mammals is lined with sensory epithelium of the same type as the undoubted olfactory parts of the nose and gives rise to nerve fibers indistinguishable from other fila olfactoria (Read, 'OS), it is probable that its innervation does not differ from that of the other parts of the olfactory organ. I n this case it is difficult to see how the nerve of the organon vomeronasale can be compared with the nervus terminalis of fishes, for the latter fibers are not known to connect with the specific cells of THE JOUHNAL O F COMYARATIVI NEUILOLOGY A N D FSYCHOLOGY.-vOL.
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## NINE FIGURES I t is over nineteen years since Pinkus ('94) first called attention to a 'new nerve' attached to the telencephalon of Protopterus, and thirty-five years since the first record of this nerve having been seen in a shark (Fritsch '78). The forms in which this nerve has now been recor
## Abstract The origin of the nervus terminalis is one of the least well understood developmental events involved in generating the cranial ganglia of the forebrain in vertebrate animals. This cranial nerve forms at the formidable interface of the anteriormost limits of migrating cranial neural cre