The brain of Acipenser. 161 
except for the inversion of the roots of the superficial ophthalmic 
and buccal. This I can not explain. 
For the Ganoids the lateral line VII roots have been described 
in Acipenser und Amia. As I have already shown (’98b) these are 
GORONOWITSCH’S roots 7. IT d. and T. II v. in Acipenser. I need 
not abstract his description, as it agrees with that given in the first 
part of this paper (page 80, 82). According to GORONOWITSCH, the 
roots unite within the cranium to form a ganglion which is entirely 
distinct from the ganglia on the V and VII proper, except that the 
VII sends a small connecting branch to this. The lateral line ganglion 
gives rise to the ophthalmicus superficialis VIL and buccalis of other 
authors, and sends a branch to the hyomandibularis, and also 
a small branch to the ramus oticus of the VII. For Amia 
the root and rami of the lateral line VII have been described by 
ALLIS (97). The root “enters the brain immediately in front of 
the acusticus, almost as a part of that root, the two roots issuing 
each by two or more rootlets from the summit of a slight swelling 
or eminence on the side of the medulla. From its under surface, 
close to its origin, or possibly as a separate root, a large branch is 
sent downward outward, and forward, to the posterior portion of the 
main trigemino-facial ganglion, where it turns outward and then 
outward and backward, traversing the ganglion and then issuing as 
a part of the truncus hyomandibularis”. The main portion of the 
root passes on to form a Y-shaped ganglion in contact with the 
V—VII ganglion, but having no connection with it. From the 
Y-shaped ganglion arise the superficial ophthalmic and buccal rami. 
The root in Ama corresponds, of course, to the ventral of the two 
roots in sharks and Acipenser, and to root 2 of STANNIUS in Teleosts. 
It arises in Amia nearer to VIII than in other forms thus far 
mentioned. Kina@sspury’s description (97) of this root in Amia 
agrees with that of ALLIS. 
For Teleosts two lateral line VII roots from the acusticum have 
been described by WRIGHT (84) in Amiurus. KINGSBURY speaks 
of and figures a single root from the acusticum in Amiurus, “which 
as WRIGHT determined innervates the neuromasts”, without ex- 
plaining the disagreement between his description and that of WRIGHT. 
He also mentions this root in several other genera. C.J. HERRICK 
(99) describes in Menidia two roots which correspond to roots 2 
and 3 of STANNIUS in those Teleosts which have five roots in the 
Zool. Jahrb. XV. Abth. f. Morph. fil 
