The brain of Acipenser. 151 
8) Cells with short neurites. — I have found four or five 
cells in the glomerular zone which probably belong to GoLsT's 
II type. The cell bodies measure about 16 by 20 u. From one end 
of the cell arises a dendrite which has several branches ending in 
glomeruli. From the other end arises a smaller process which 
divides into numerous smooth branches which are lost in the glome- 
rular zone. I am not sure that this smaller process is a neurite, 
but think it probable. I give drawings of these cells in Figs. O and R. 
Fig. R. 
b) Olfactory Fibres. 
The olfactory fibres may run singly or in small bundles to the 
glomeruli, and either a single fibre or several fibres from one or 
several bundles may enter the same glomerulus. Fibres occasionally 
send branches to two or more glomeruli, but usually branch only 
within a single glomerulus. The end-branching is more often dicho- 
tomous than otherwise, but is often irregular and sometimes very 
complex. I give drawings of characteristic endings in Fig. 8. 
c) Glomeruli (Figs. T, U). 
The number of olfactory fibres which may enter a glomerulus 
varies from one or two to a large number. The glomeruli vary to 
a like extent as to size and also as to the dendrites which enter into 
their formation. The large glomeruli are formed chiefly by dendrites 
of mitral cells, but almost always include branches from the den- 
drites of one or more of the other cells. The smaller glomeruli are 
