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ventro-lateral group. The nucleus is now well developed; the dorso- 
lateral part lies more ventrally than in the camel, so that we better 
speak of a dorsal group and a ventro-lateral group in this animal. 
More frontally the medial group becomes thicker and then contains 
cells of a larger type than those behind. The dorso-lateral group first 
disappears, and then the medial, so that the large cells of the ventro- 
lateral group remain longest visible. . . 
The nucleus extends 116 sections in front of the calamus. 
The oliva inferior is much better developed in the lama than in 
the camel. Also here it occurs latero-ventrally in the region of the spinal 
part of nucleus XII. It contains more cells than that of the camel, 
and the cell type in general is larger. On the level of the frontal pole 
of nucleus X dorsalis it is still clearly present; it decreases rapidly 
and ceases at the frontal extremity of the nucleus ambiguus (fig. 14). 
The nucleus reticularis inferior is extremely well developed in the 
lama. It grows dorsally over the olive and spreads medially from 
the raphe into the substantia reticularis. A clearly defined cell group 
lies under the efferent vagus root. This disappears first, and the rest 
near the region of the nue. facialis. 
The dorsal motor vagus nucleus of Camelides lies, as in all 
other animals, in a region, that is rich in blood-vessels. All the 
illustrations of it, which occur in this article and which have been 
made after microphotographs, show cross-sections of large blood-vessels. 
The form of the nucleus differs in Camelidae as well as in the 
sheep and goat, from that in the cow in so far as in the last-named 
animal it attains its greatest extent on the half of its extent, while 
in the first-named animals it does so not before the frontal third 
part. Since in the cow ?7/, of the nucleus lies spinally from the 
calamus, the most developed part of the nucleus, which at this place 
is clearly less in size in other ruminantia, begins just frontally from 
the calamus and we must therefore look for the centre of the 
mnnervation of the omasus in the most caudal portion of the fossa 
rhomboidea, at least in the ov and sheep. In the goat and in Camelidae, 
where a larger part of the nucleus stretches into the closed portion 
of the oblongata than in the first-named animals, that centrum may 
stretch, or at least partially, somewhat spinally from the calamus. 
LesBki has shown that a nervus accessorius spinalis, such as we 
know in all other mammals hitherto examined, as a nerve which 
arises from a nucleus of its own in the cervical cord and runs 
