788 



especially in the ventral poi'tion, in vvliioli portion folds occur. 

 In this respect there appear to be individual differences. In one 

 series they are very distinct. The posterior portion grows out in a 

 point, stretches as far as the back wall of the conus and even 

 pushes the latter outwards in .a point at some places; the anterior 

 portion sends out strong folds at its base and somewhat higher 

 (fig. 14). Further back these increase till finally the whole ventricle 

 wall is folded. The greatest de[)th here measures 0.550 mm. the 

 greatest width 0.140 mm. In the other series the canal appeared 

 less deep here, though more than twice as broad ; here the measu- 

 rements were 0.480 and 0.3 mm. respectively; the folds occur later, 

 are less numerous and much smaller. The ventriculus terminalis 

 of the goat is about 3 mm. long. The canal is not obliterated. 



Ovif nries. The end of the lumbal medulla on section is round, 

 as is also the central canal. The latter is partially obliterated and 

 the epithelium also exhibits distinct signs of degeneration. As in the 

 goat, clearly defined bundles also occur venti-ally from the canal : 

 here however, they lie nearer the median line and do not reach 

 so far caudally. The grey matter is less well developed than in 

 the goat and cells are fewer in number. The septum posterius is 

 partially cleft-shaped, the fissura anterior, as in the horse, is much 

 wider in the more central portion than at the surface. 



Caudally the conns becomes heart-shaped in section, the canal 

 shifts in a ventral direction, deepens and broadens ventrally, and 

 then becomes bell-shaped in section, owing to the flattening of the 

 broad lower wall. Its depth and breadth are here 0.2 and 0.170 mm. 

 respectively. In this region we see, at the back, indications of folds 

 and the above-mentioned bundles will be found to lie immediately 

 against each other and right against the lower wall. More caudally 

 the canal becomes narrower again, the septum posterius here is a 

 cleft almost as well developed as the fissura anterior, still further 

 back, the septum becomes shorter and we frequently see the remainder 

 of it as a small cleft-like space connected with the posterior wall 

 by a fine pia-bundle. At this juncture the conns is distinctly 

 kidney-shaped on section, cells are still present in all the sections, 

 the majority in the anterior horn but a few also in the posterior horn. 

 The central canal widens into the ventriculus terminalis, deepens 

 as it proceeds backwards and soon reaches the posterior circumference, 

 many sections show the wall at this place bulged in a point by 

 the ventriculus. Here shallow folds and short bulges are present 

 in the ventricle wall. (Fig. 15). The back wall of the conus is 



