Herrick, Zerminal Buds of Fishes. 133 
in a special center, the so-called lobus trigemini, and that this 
center is homologous with the structure of that name in Acipen- 
ser and teleosts. 
Now it proves that neither of these assumptions is true, or 
at best they are only partially true. The ‘‘lobus trigemini”’ 
of elasmobranchs is homologous with the part so named in 
Acipenser, but in both cases the part is a derivative of the 
tuberculum acusticum and is related to the peripheral 
nerves from lateral line organs. The work of JOHNSTON 
leaves no room for doubt on this point, and we may adopt his 
designation for this lobe, ‘‘lobus lineae lateralis.”” The so- 
called lobus trigemini of certain teleosts (cyprinoids and silur- 
oids) is now known to bea totally different structure (K1NGs- 
BURY, 97; HERRICK, ’O1), a center for terminal buds, having 
nothing to do with any part of the acustico-lateralis system. It 
is termed by recent writers the lobus facialis, and, in view of 
ALLIS’ perpetuation of the old confusion growing out of a 
false nomenclature, we may well adopt the suggestion of 
Houser (’o1), ‘‘The term “#zgemznal lobe has been so variously 
used that it should be dropped from our nomenclature.” 
We are fortunately no longer shut up to speculation re- 
garding the exact relations of these nerve roots in selachians. 
In the course of a report upon his analysis of the cranial nerves 
of Squalus acanthias, STRONG (’03) writes, ‘“The ramus mandi- 
bularis externus VII is apparently derived practically entirely 
from the more dorsal of the two lateral line roots [of the 
facialis], the ramus buccalis receiving the major part of the re- 
mainder of this root, while the ramus ophthalmicus superficialis 
VII is principally composed of the bulk of the more ventral 
lateral line root. This would apparently negative the view that 
the ampullary organs are modified end-buds and the dorsal root 
-an end-bud root.”’ This destroys completely the foundations of 
A.tts’ labored argument from the structure of the r. ophthalmi- 
cus superficialis. In brief, we may conclude from the works of 
Houser, JOHNSTON, STRONG and others, that the terminal bud 
and lateralis centers in the brains of cyclostomes, selachians and 
ganoids are as distinct as I find them to be in the teleosts and 
