980 
3. The nucleus hypoglossi in Phoeaena is throughout the half of 
its extent joined to the ventral cervical grey matter, and consequently 
lies as far as its spinal half is concerned, in a more ventral region 
than in other mammals. In the frontal portion of this connection a 
cell group appears, lateral from the anterior horn rest, which in 
several sections is very distinetly connected with the dorsal motor 
vagus nucleus. Likewise the connecting nucleus between this vagus 
nucleus and the tongue nucleus (nucleus intermedius ?) is in many 
places well developed. The free tongue nucleus is grouped into three, 
and more frontally into as many as six, groups of cells. 
4. As far as the immediate vicinity of the calamus, efferent acces 
sorius roots can be observed. The XI nucleus in general is poorly 
developed, and only exceptionally does it contain 8—10 cells. The 
cells are of a small type. Until near the calamus it can be met with 
in the angle between the anterior and posterior horns; spinally it 
may radiate from here in a medial direction (connection with X 
dorsalis), along the dorso-lateral edge of the frontal horn, i.e. in a 
ventro-lateral direction and upwards along the lower edge of the 
posterior horn. A separate cell group of it is repeatedly to be observed 
at the caudo-ventral angle of the posterior horn. 
5. The oliva inferior appears very late, viz. near the calamus; it 
spreads very far frontally however into the facialis region. It is 
extraordinarily developed. In its development several groups appear quite 
independently of each other. First next the raphé a portion develops 
ventrally, which grows out rapidly and is connected at first for a small 
distance through the raphé with the corresponding portion of the 
other side. After this a second portion appears ventrally from the 
first, and is also at first connected with that of the other side by 
an intermediate olive. This second portion develops very strongly, 
and pushes the first-mentioned upwards, whereby the latter gradually 
shrinks, and finally disappears before the part lying distally has 
attained its greatest development. These parts form together the 
medial olive. As a third group of cells there appears in the frontal 
third portion of the last-mentioned, and laterally from it, a complex 
consisting of two lamella, a short medial one and a long lateral 
one. This corresponds with the principal olive. Besides these three 
main groups, several smaller ones appear from the beginning, but 
also later, invariably in the lateral regions, and remain a longer or 
shorter time. Their identification is not sure. 
6. The nucleus reticularis inferior contains small cells and is 
poorly developed. 
