354 E. T. NEWTON. 



corpus centrale is intimately connected by a network of 

 fibres with the large mass of the ganglionic cells lying 

 above them. But here, again, it is probable that connective 

 tissue combines with the nervous tissue to produce the 

 appearance presented by their sections. When the thinnest 

 sections of the corpus centrale are very highly magnified, the 

 fibres from the surrounding cells may be seen collecting 

 together and forming the partitions which give this body 

 its laminated appearance. These partitions seem to be 

 intimately connected with the enclosed granular matter, 

 which itself gives evidence of being made up of a network 

 of fibres ; but this was not clearly shown. 



With regard to the general form of the corpus centrale, if 

 we restrict this term to the laminated granular matter, it 

 will be obvious, from what has been said above, that it has a 

 broad truncated hinder end, and diminishes in size towards 

 the front, the number of the laminse gradually increasing 

 from before backwards. In frontal sections the upper surface 

 is convex. The form of the lower surface will be best under- 

 stood by reference to the figures (8, 11, 9). Anteriorly, it 

 passes gradually into the cells lyiug below, which fill up 

 the space between the trabeculae. Posteriorly the granular 

 substance occupies the whole of this space, and is, there- 

 fore, pointed below. The sides are rounded. 



I find that Flogel's description of the central body does 

 not agree with my own observations, as given above ; but 

 this, to some extent at least, is due to our sections not 

 being in precisely the same plane, and partly, perhaps, to 

 our not including in the description exactly the same parts. 

 With regard to the number of the laminae (Flogel mentions 

 eight), my specimens show most clearly an increase in 

 number, from before backwards, as above described. 



Ojitic gangliotz. — I have not yet had the opportunity of 

 worldng out the structure of this complicated apparatus so 

 fully as it deserves, and can only in the present paper give 

 the following brief description. Horizontal sections show 

 two lenticular bodies placed obliquely and surrounded by a 

 thick layer of cells. The nerve fibres passing from the 

 front and back parts of the eye cross before entering the 

 first and smallest lenticular body ; they cross again on 

 leaving it, and before entering the second and larger lenti- 

 cular body. Between the latter and the brain the fibres 

 cross for the third time. After entering the hemispheres 

 some of the fibres may be seen passing forwards into the 

 mass of cells lying in front of the corpus centrale ; wliile 

 there are indications of others passing across near the 



