( 1065 ) 
hot find here a splitting of the nucleus reticularis superior into a 
dorsal and ventro-lateral group respectively (4 and 4, vesp.). The 
cells are here spread more equally through the formatio reticularis, 
principally more dorsal in the bulb. Whether of the cells tying 
between the bundles of the lateral lemniscus some must be considered 
as very ventrally situated reticular cells, belonging to the said ne. 
reticularis, L do not venture to decide. | do not consider it probable, 
however. 
Owing to the extreme diffuseness in the arrangement of the reticular 
elements of the various vertebrates and the frequent difficulties in 
defining these from non-reticular elements, it is not easy to state the 
result of my labours in a few words. Nevertheless | believe I may 
place in the foreground the following facts. 
|. As far as | know, in the lateral field of the oblongata, a more 
or less pronounced massing of the large reticular cells occurs in all 
vertebrates except in cyclostomes and amphibians. 
2. In all animals, moreover, large cells occur in the raphe in the 
caudal part of the oblongata; in the frontal part of the oblongata 
the large cells are wanting in the raphe, with the exception ot 
chelone, where they also occur on the level of the trigeminus-nucleus 
as an independent group, distinct from the vagus group. 
3. In the reptiles, birds and mammals a raphe-nucleus consisting 
of small cells is constantly found in the anterior part of the oblongata 
about the posterior boundary of the corpora quadrigemina posteriora. 
4. The frontal group of the lateral reticular cells undergoes in 
the phylogenesis a strong increase, and a division in such a way 
that «a portion of these cells retains their dorsal position, while 
another portion (the number varies in the different animals) acquires 
a more ventro-lateral position on the lateral leminiscus, or directly 
medially to it. 
5. Phocaena exhibits a deviation from the general mammalian 
type by a lesser differentiation of the reticular nuclei in the anterior 
part of the oblongata. 
