xliv JOURNAL OF COMPARATIVE NEUROLOGY. 
of origin in the epithelium. ‘These resemble the sense cells of inverte- 
brates. Their outer ends reach to the surface but are not provided with 
sense hairs. Their inner ends are continued centrally as fibers which 
enter the sensory nerves. ‘These sense cells are found generally in the 
epithelium and especially in the oral tentacles where they are grouped 
to form the special sense organs which have heretofore been compared 
with the taste buds and end buds of typical vertebrates. Nothing is 
stated with regard to the central relations of these two sets of fibers. 
The author describes certain structures which he regards as spinal 
ganglia but their finer structure is not sufficiently well made out to 
warrant any conclusion as to their character. J. Bivde 
On the Lobus Impar of the Brain of Cyprinoid Fishes.' 
In his work entitled, ‘‘Vom Bau des Wirbeltiergehirns,” B. Hat- 
LER describes extensive anastomoses between nerve cells in the lobus 
impar of the medulla oblongata of the cyprinoid fishes and states 
that this structure is an especially favorable object for the demonstra- 
tion of such anastomoses. GROTH examined haemalum, carmine and 
GoLG! preparations of several carp-like fishes in order to check up the 
observations of HALLER, but without finding any evidence of such 
anastomoses. ‘There is an extensive but uncritical review of the litera- 
ture of these brains and some description from his own preparations of 
the anatomical structure of this part of the brain, in the course of 
which, however, nothing of morphological importance is brought out. 
Ce Je Ve 
'GrotH, A. Ueber den Lobus impar der Medulla oblongata bei Cypri- 
noiden. Dissertation. Miinchen, 1900. 
